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819 lines
15 KiB
C
819 lines
15 KiB
C
/*
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* Copyright (C) 1984-2011 Mark Nudelman
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*
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* You may distribute under the terms of either the GNU General Public
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* License or the Less License, as specified in the README file.
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*
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* For more information about less, or for information on how to
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* contact the author, see the README file.
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*/
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#include "less.h"
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#if HAVE_STAT
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#include <sys/stat.h>
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#endif
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public int fd0 = 0;
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extern int new_file;
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extern int errmsgs;
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extern int cbufs;
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extern char *every_first_cmd;
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extern int any_display;
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extern int force_open;
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extern int is_tty;
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extern int sigs;
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extern IFILE curr_ifile;
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extern IFILE old_ifile;
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extern struct scrpos initial_scrpos;
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extern void constant *ml_examine;
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#if SPACES_IN_FILENAMES
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extern char openquote;
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extern char closequote;
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#endif
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#if LOGFILE
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extern int logfile;
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extern int force_logfile;
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extern char *namelogfile;
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#endif
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#if HAVE_STAT_INO
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public dev_t curr_dev;
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public ino_t curr_ino;
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#endif
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char *curr_altfilename = NULL;
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static void *curr_altpipe;
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/*
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* Textlist functions deal with a list of words separated by spaces.
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* init_textlist sets up a textlist structure.
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* forw_textlist uses that structure to iterate thru the list of
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* words, returning each one as a standard null-terminated string.
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* back_textlist does the same, but runs thru the list backwards.
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*/
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public void
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init_textlist(tlist, str)
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struct textlist *tlist;
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char *str;
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{
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char *s;
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#if SPACES_IN_FILENAMES
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int meta_quoted = 0;
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int delim_quoted = 0;
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char *esc = get_meta_escape();
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int esclen = strlen(esc);
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#endif
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tlist->string = skipsp(str);
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tlist->endstring = tlist->string + strlen(tlist->string);
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for (s = str; s < tlist->endstring; s++)
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{
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#if SPACES_IN_FILENAMES
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if (meta_quoted)
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{
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meta_quoted = 0;
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} else if (esclen > 0 && s + esclen < tlist->endstring &&
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strncmp(s, esc, esclen) == 0)
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{
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meta_quoted = 1;
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s += esclen - 1;
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} else if (delim_quoted)
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{
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if (*s == closequote)
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delim_quoted = 0;
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} else /* (!delim_quoted) */
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{
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if (*s == openquote)
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delim_quoted = 1;
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else if (*s == ' ')
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*s = '\0';
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}
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#else
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if (*s == ' ')
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*s = '\0';
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#endif
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}
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}
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public char *
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forw_textlist(tlist, prev)
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struct textlist *tlist;
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char *prev;
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{
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char *s;
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/*
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* prev == NULL means return the first word in the list.
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* Otherwise, return the word after "prev".
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*/
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if (prev == NULL)
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s = tlist->string;
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else
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s = prev + strlen(prev);
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if (s >= tlist->endstring)
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return (NULL);
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while (*s == '\0')
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s++;
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if (s >= tlist->endstring)
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return (NULL);
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return (s);
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}
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public char *
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back_textlist(tlist, prev)
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struct textlist *tlist;
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char *prev;
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{
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char *s;
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/*
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* prev == NULL means return the last word in the list.
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* Otherwise, return the word before "prev".
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*/
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if (prev == NULL)
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s = tlist->endstring;
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else if (prev <= tlist->string)
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return (NULL);
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else
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s = prev - 1;
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while (*s == '\0')
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s--;
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if (s <= tlist->string)
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return (NULL);
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while (s[-1] != '\0' && s > tlist->string)
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s--;
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return (s);
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}
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/*
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* Close the current input file.
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*/
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static void
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close_file()
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{
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struct scrpos scrpos;
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if (curr_ifile == NULL_IFILE)
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return;
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/*
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* Save the current position so that we can return to
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* the same position if we edit this file again.
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*/
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get_scrpos(&scrpos);
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if (scrpos.pos != NULL_POSITION)
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{
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store_pos(curr_ifile, &scrpos);
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lastmark();
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}
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/*
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* Close the file descriptor, unless it is a pipe.
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*/
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ch_close();
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/*
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* If we opened a file using an alternate name,
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* do special stuff to close it.
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*/
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if (curr_altfilename != NULL)
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{
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close_altfile(curr_altfilename, get_filename(curr_ifile),
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curr_altpipe);
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free(curr_altfilename);
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curr_altfilename = NULL;
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}
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curr_ifile = NULL_IFILE;
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#if HAVE_STAT_INO
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curr_ino = curr_dev = 0;
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#endif
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}
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/*
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* Edit a new file (given its name).
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* Filename == "-" means standard input.
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* Filename == NULL means just close the current file.
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*/
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public int
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edit(filename)
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char *filename;
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{
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if (filename == NULL)
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return (edit_ifile(NULL_IFILE));
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return (edit_ifile(get_ifile(filename, curr_ifile)));
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}
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/*
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* Edit a new file (given its IFILE).
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* ifile == NULL means just close the current file.
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*/
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public int
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edit_ifile(ifile)
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IFILE ifile;
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{
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int f;
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int answer;
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int no_display;
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int chflags;
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char *filename;
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char *open_filename;
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char *qopen_filename;
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char *alt_filename;
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void *alt_pipe;
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IFILE was_curr_ifile;
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PARG parg;
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if (ifile == curr_ifile)
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{
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/*
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* Already have the correct file open.
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*/
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return (0);
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}
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/*
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* We must close the currently open file now.
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* This is necessary to make the open_altfile/close_altfile pairs
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* nest properly (or rather to avoid nesting at all).
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* {{ Some stupid implementations of popen() mess up if you do:
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* fA = popen("A"); fB = popen("B"); pclose(fA); pclose(fB); }}
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*/
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#if LOGFILE
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end_logfile();
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#endif
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was_curr_ifile = save_curr_ifile();
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if (curr_ifile != NULL_IFILE)
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{
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chflags = ch_getflags();
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close_file();
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if ((chflags & CH_HELPFILE) && held_ifile(was_curr_ifile) <= 1)
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{
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/*
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* Don't keep the help file in the ifile list.
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*/
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del_ifile(was_curr_ifile);
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was_curr_ifile = old_ifile;
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}
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}
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if (ifile == NULL_IFILE)
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{
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/*
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* No new file to open.
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* (Don't set old_ifile, because if you call edit_ifile(NULL),
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* you're supposed to have saved curr_ifile yourself,
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* and you'll restore it if necessary.)
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*/
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unsave_ifile(was_curr_ifile);
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return (0);
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}
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filename = save(get_filename(ifile));
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/*
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* See if LESSOPEN specifies an "alternate" file to open.
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*/
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alt_pipe = NULL;
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alt_filename = open_altfile(filename, &f, &alt_pipe);
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open_filename = (alt_filename != NULL) ? alt_filename : filename;
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qopen_filename = shell_unquote(open_filename);
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chflags = 0;
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if (alt_pipe != NULL)
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{
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/*
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* The alternate "file" is actually a pipe.
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* f has already been set to the file descriptor of the pipe
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* in the call to open_altfile above.
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* Keep the file descriptor open because it was opened
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* via popen(), and pclose() wants to close it.
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*/
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chflags |= CH_POPENED;
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} else if (strcmp(open_filename, "-") == 0)
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{
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/*
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* Use standard input.
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* Keep the file descriptor open because we can't reopen it.
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*/
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f = fd0;
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chflags |= CH_KEEPOPEN;
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/*
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* Must switch stdin to BINARY mode.
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*/
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SET_BINARY(f);
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#if MSDOS_COMPILER==DJGPPC
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/*
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* Setting stdin to binary by default causes
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* Ctrl-C to not raise SIGINT. We must undo
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* that side-effect.
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*/
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__djgpp_set_ctrl_c(1);
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#endif
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} else if (strcmp(open_filename, FAKE_HELPFILE) == 0)
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{
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f = -1;
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chflags |= CH_HELPFILE;
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} else if ((parg.p_string = bad_file(open_filename)) != NULL)
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{
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/*
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* It looks like a bad file. Don't try to open it.
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*/
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error("%s", &parg);
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free(parg.p_string);
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err1:
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if (alt_filename != NULL)
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{
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close_altfile(alt_filename, filename, alt_pipe);
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free(alt_filename);
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}
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del_ifile(ifile);
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free(qopen_filename);
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free(filename);
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/*
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* Re-open the current file.
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*/
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if (was_curr_ifile == ifile)
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{
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/*
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* Whoops. The "current" ifile is the one we just deleted.
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* Just give up.
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*/
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quit(QUIT_ERROR);
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}
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reedit_ifile(was_curr_ifile);
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return (1);
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} else if ((f = open(qopen_filename, OPEN_READ)) < 0)
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{
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/*
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* Got an error trying to open it.
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*/
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parg.p_string = errno_message(filename);
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error("%s", &parg);
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free(parg.p_string);
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goto err1;
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} else
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{
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chflags |= CH_CANSEEK;
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if (!force_open && !opened(ifile) && bin_file(f))
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{
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/*
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* Looks like a binary file.
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* Ask user if we should proceed.
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*/
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parg.p_string = filename;
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answer = query("\"%s\" may be a binary file. See it anyway? ",
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&parg);
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if (answer != 'y' && answer != 'Y')
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{
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close(f);
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goto err1;
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}
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}
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}
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/*
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* Get the new ifile.
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* Get the saved position for the file.
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*/
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if (was_curr_ifile != NULL_IFILE)
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{
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old_ifile = was_curr_ifile;
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unsave_ifile(was_curr_ifile);
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}
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curr_ifile = ifile;
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curr_altfilename = alt_filename;
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curr_altpipe = alt_pipe;
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set_open(curr_ifile); /* File has been opened */
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get_pos(curr_ifile, &initial_scrpos);
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new_file = TRUE;
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ch_init(f, chflags);
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if (!(chflags & CH_HELPFILE))
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{
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#if LOGFILE
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if (namelogfile != NULL && is_tty)
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use_logfile(namelogfile);
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#endif
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#if HAVE_STAT_INO
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/* Remember the i-number and device of the opened file. */
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{
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struct stat statbuf;
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int r = stat(qopen_filename, &statbuf);
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if (r == 0)
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{
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curr_ino = statbuf.st_ino;
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curr_dev = statbuf.st_dev;
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}
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}
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#endif
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if (every_first_cmd != NULL)
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ungetsc(every_first_cmd);
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}
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free(qopen_filename);
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no_display = !any_display;
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flush();
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any_display = TRUE;
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if (is_tty)
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{
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/*
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* Output is to a real tty.
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*/
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/*
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* Indicate there is nothing displayed yet.
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*/
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pos_clear();
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clr_linenum();
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#if HILITE_SEARCH
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clr_hilite();
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#endif
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cmd_addhist(ml_examine, filename);
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if (no_display && errmsgs > 0)
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{
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/*
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* We displayed some messages on error output
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* (file descriptor 2; see error() function).
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* Before erasing the screen contents,
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* display the file name and wait for a keystroke.
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*/
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parg.p_string = filename;
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error("%s", &parg);
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}
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}
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free(filename);
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return (0);
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}
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/*
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* Edit a space-separated list of files.
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* For each filename in the list, enter it into the ifile list.
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* Then edit the first one.
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*/
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public int
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edit_list(filelist)
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char *filelist;
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{
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IFILE save_ifile;
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char *good_filename;
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char *filename;
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char *gfilelist;
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char *gfilename;
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struct textlist tl_files;
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struct textlist tl_gfiles;
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save_ifile = save_curr_ifile();
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good_filename = NULL;
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/*
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* Run thru each filename in the list.
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* Try to glob the filename.
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* If it doesn't expand, just try to open the filename.
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* If it does expand, try to open each name in that list.
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*/
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init_textlist(&tl_files, filelist);
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filename = NULL;
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while ((filename = forw_textlist(&tl_files, filename)) != NULL)
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{
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gfilelist = lglob(filename);
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init_textlist(&tl_gfiles, gfilelist);
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gfilename = NULL;
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while ((gfilename = forw_textlist(&tl_gfiles, gfilename)) != NULL)
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{
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if (edit(gfilename) == 0 && good_filename == NULL)
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good_filename = get_filename(curr_ifile);
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}
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free(gfilelist);
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}
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/*
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* Edit the first valid filename in the list.
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*/
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if (good_filename == NULL)
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{
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unsave_ifile(save_ifile);
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return (1);
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}
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if (get_ifile(good_filename, curr_ifile) == curr_ifile)
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{
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/*
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* Trying to edit the current file; don't reopen it.
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*/
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unsave_ifile(save_ifile);
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return (0);
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}
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reedit_ifile(save_ifile);
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return (edit(good_filename));
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}
|
|
|
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/*
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* Edit the first file in the command line (ifile) list.
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*/
|
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public int
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edit_first()
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{
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curr_ifile = NULL_IFILE;
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return (edit_next(1));
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}
|
|
|
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/*
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* Edit the last file in the command line (ifile) list.
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*/
|
|
public int
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edit_last()
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{
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curr_ifile = NULL_IFILE;
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return (edit_prev(1));
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}
|
|
|
|
|
|
/*
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* Edit the n-th next or previous file in the command line (ifile) list.
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|
*/
|
|
static int
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edit_istep(h, n, dir)
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IFILE h;
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int n;
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int dir;
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{
|
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IFILE next;
|
|
|
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/*
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|
* Skip n filenames, then try to edit each filename.
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|
*/
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for (;;)
|
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{
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next = (dir > 0) ? next_ifile(h) : prev_ifile(h);
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if (--n < 0)
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{
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if (edit_ifile(h) == 0)
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break;
|
|
}
|
|
if (next == NULL_IFILE)
|
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{
|
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/*
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* Reached end of the ifile list.
|
|
*/
|
|
return (1);
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|
}
|
|
if (ABORT_SIGS())
|
|
{
|
|
/*
|
|
* Interrupt breaks out, if we're in a long
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|
* list of files that can't be opened.
|
|
*/
|
|
return (1);
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}
|
|
h = next;
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|
}
|
|
/*
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|
* Found a file that we can edit.
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|
*/
|
|
return (0);
|
|
}
|
|
|
|
static int
|
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edit_inext(h, n)
|
|
IFILE h;
|
|
int n;
|
|
{
|
|
return (edit_istep(h, n, +1));
|
|
}
|
|
|
|
public int
|
|
edit_next(n)
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int n;
|
|
{
|
|
return edit_istep(curr_ifile, n, +1);
|
|
}
|
|
|
|
static int
|
|
edit_iprev(h, n)
|
|
IFILE h;
|
|
int n;
|
|
{
|
|
return (edit_istep(h, n, -1));
|
|
}
|
|
|
|
public int
|
|
edit_prev(n)
|
|
int n;
|
|
{
|
|
return edit_istep(curr_ifile, n, -1);
|
|
}
|
|
|
|
/*
|
|
* Edit a specific file in the command line (ifile) list.
|
|
*/
|
|
public int
|
|
edit_index(n)
|
|
int n;
|
|
{
|
|
IFILE h;
|
|
|
|
h = NULL_IFILE;
|
|
do
|
|
{
|
|
if ((h = next_ifile(h)) == NULL_IFILE)
|
|
{
|
|
/*
|
|
* Reached end of the list without finding it.
|
|
*/
|
|
return (1);
|
|
}
|
|
} while (get_index(h) != n);
|
|
|
|
return (edit_ifile(h));
|
|
}
|
|
|
|
public IFILE
|
|
save_curr_ifile()
|
|
{
|
|
if (curr_ifile != NULL_IFILE)
|
|
hold_ifile(curr_ifile, 1);
|
|
return (curr_ifile);
|
|
}
|
|
|
|
public void
|
|
unsave_ifile(save_ifile)
|
|
IFILE save_ifile;
|
|
{
|
|
if (save_ifile != NULL_IFILE)
|
|
hold_ifile(save_ifile, -1);
|
|
}
|
|
|
|
/*
|
|
* Reedit the ifile which was previously open.
|
|
*/
|
|
public void
|
|
reedit_ifile(save_ifile)
|
|
IFILE save_ifile;
|
|
{
|
|
IFILE next;
|
|
IFILE prev;
|
|
|
|
/*
|
|
* Try to reopen the ifile.
|
|
* Note that opening it may fail (maybe the file was removed),
|
|
* in which case the ifile will be deleted from the list.
|
|
* So save the next and prev ifiles first.
|
|
*/
|
|
unsave_ifile(save_ifile);
|
|
next = next_ifile(save_ifile);
|
|
prev = prev_ifile(save_ifile);
|
|
if (edit_ifile(save_ifile) == 0)
|
|
return;
|
|
/*
|
|
* If can't reopen it, open the next input file in the list.
|
|
*/
|
|
if (next != NULL_IFILE && edit_inext(next, 0) == 0)
|
|
return;
|
|
/*
|
|
* If can't open THAT one, open the previous input file in the list.
|
|
*/
|
|
if (prev != NULL_IFILE && edit_iprev(prev, 0) == 0)
|
|
return;
|
|
/*
|
|
* If can't even open that, we're stuck. Just quit.
|
|
*/
|
|
quit(QUIT_ERROR);
|
|
}
|
|
|
|
public void
|
|
reopen_curr_ifile()
|
|
{
|
|
IFILE save_ifile = save_curr_ifile();
|
|
close_file();
|
|
reedit_ifile(save_ifile);
|
|
}
|
|
|
|
/*
|
|
* Edit standard input.
|
|
*/
|
|
public int
|
|
edit_stdin()
|
|
{
|
|
if (isatty(fd0))
|
|
{
|
|
error("Missing filename (\"less --help\" for help)", NULL_PARG);
|
|
quit(QUIT_OK);
|
|
}
|
|
return (edit("-"));
|
|
}
|
|
|
|
/*
|
|
* Copy a file directly to standard output.
|
|
* Used if standard output is not a tty.
|
|
*/
|
|
public void
|
|
cat_file()
|
|
{
|
|
register int c;
|
|
|
|
while ((c = ch_forw_get()) != EOI)
|
|
putchr(c);
|
|
flush();
|
|
}
|
|
|
|
#if LOGFILE
|
|
|
|
/*
|
|
* If the user asked for a log file and our input file
|
|
* is standard input, create the log file.
|
|
* We take care not to blindly overwrite an existing file.
|
|
*/
|
|
public void
|
|
use_logfile(filename)
|
|
char *filename;
|
|
{
|
|
register int exists;
|
|
register int answer;
|
|
PARG parg;
|
|
|
|
if (ch_getflags() & CH_CANSEEK)
|
|
/*
|
|
* Can't currently use a log file on a file that can seek.
|
|
*/
|
|
return;
|
|
|
|
/*
|
|
* {{ We could use access() here. }}
|
|
*/
|
|
filename = shell_unquote(filename);
|
|
exists = open(filename, OPEN_READ);
|
|
close(exists);
|
|
exists = (exists >= 0);
|
|
|
|
/*
|
|
* Decide whether to overwrite the log file or append to it.
|
|
* If it doesn't exist we "overwrite" it.
|
|
*/
|
|
if (!exists || force_logfile)
|
|
{
|
|
/*
|
|
* Overwrite (or create) the log file.
|
|
*/
|
|
answer = 'O';
|
|
} else
|
|
{
|
|
/*
|
|
* Ask user what to do.
|
|
*/
|
|
parg.p_string = filename;
|
|
answer = query("Warning: \"%s\" exists; Overwrite, Append or Don't log? ", &parg);
|
|
}
|
|
|
|
loop:
|
|
switch (answer)
|
|
{
|
|
case 'O': case 'o':
|
|
/*
|
|
* Overwrite: create the file.
|
|
*/
|
|
logfile = creat(filename, 0644);
|
|
break;
|
|
case 'A': case 'a':
|
|
/*
|
|
* Append: open the file and seek to the end.
|
|
*/
|
|
logfile = open(filename, OPEN_APPEND);
|
|
if (lseek(logfile, (off_t)0, SEEK_END) == BAD_LSEEK)
|
|
{
|
|
close(logfile);
|
|
logfile = -1;
|
|
}
|
|
break;
|
|
case 'D': case 'd':
|
|
/*
|
|
* Don't do anything.
|
|
*/
|
|
free(filename);
|
|
return;
|
|
case 'q':
|
|
quit(QUIT_OK);
|
|
/*NOTREACHED*/
|
|
default:
|
|
/*
|
|
* Eh?
|
|
*/
|
|
answer = query("Overwrite, Append, or Don't log? (Type \"O\", \"A\", \"D\" or \"q\") ", NULL_PARG);
|
|
goto loop;
|
|
}
|
|
|
|
if (logfile < 0)
|
|
{
|
|
/*
|
|
* Error in opening logfile.
|
|
*/
|
|
parg.p_string = filename;
|
|
error("Cannot write to \"%s\"", &parg);
|
|
free(filename);
|
|
return;
|
|
}
|
|
free(filename);
|
|
SET_BINARY(logfile);
|
|
}
|
|
|
|
#endif
|