mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-15 10:17:20 +00:00
275 lines
7.5 KiB
C
275 lines
7.5 KiB
C
/* flex - tool to generate fast lexical analyzers */
|
||
|
||
/* Copyright (c) 1990 The Regents of the University of California. */
|
||
/* All rights reserved. */
|
||
|
||
/* This code is derived from software contributed to Berkeley by */
|
||
/* Vern Paxson. */
|
||
|
||
/* The United States Government has rights in this work pursuant */
|
||
/* to contract no. DE-AC03-76SF00098 between the United States */
|
||
/* Department of Energy and the University of California. */
|
||
|
||
/* This file is part of flex. */
|
||
|
||
/* Redistribution and use in source and binary forms, with or without */
|
||
/* modification, are permitted provided that the following conditions */
|
||
/* are met: */
|
||
|
||
/* 1. Redistributions of source code must retain the above copyright */
|
||
/* notice, this list of conditions and the following disclaimer. */
|
||
/* 2. Redistributions in binary form must reproduce the above copyright */
|
||
/* notice, this list of conditions and the following disclaimer in the */
|
||
/* documentation and/or other materials provided with the distribution. */
|
||
|
||
/* Neither the name of the University nor the names of its contributors */
|
||
/* may be used to endorse or promote products derived from this software */
|
||
/* without specific prior written permission. */
|
||
|
||
/* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR */
|
||
/* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED */
|
||
/* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR */
|
||
/* PURPOSE. */
|
||
|
||
#include "flexdef.h"
|
||
|
||
/* Take note: The buffer object is sometimes used as a String buffer (one
|
||
* continuous string), and sometimes used as a list of strings, usually line by
|
||
* line.
|
||
*
|
||
* The type is specified in buf_init by the elt_size. If the elt_size is
|
||
* sizeof(char), then the buffer should be treated as string buffer. If the
|
||
* elt_size is sizeof(char*), then the buffer should be treated as a list of
|
||
* strings.
|
||
*
|
||
* Certain functions are only appropriate for one type or the other.
|
||
*/
|
||
|
||
/* global buffers. */
|
||
struct Buf userdef_buf; /**< for user #definitions triggered by cmd-line. */
|
||
struct Buf defs_buf; /**< for #define's autogenerated. List of strings. */
|
||
struct Buf yydmap_buf; /**< string buffer to hold yydmap elements */
|
||
struct Buf m4defs_buf; /**< m4 definitions. List of strings. */
|
||
struct Buf top_buf; /**< contains %top code. String buffer. */
|
||
|
||
struct Buf *buf_print_strings(struct Buf * buf, FILE* out)
|
||
{
|
||
int i;
|
||
|
||
if(!buf || !out)
|
||
return buf;
|
||
|
||
for (i=0; i < buf->nelts; i++){
|
||
const char * s = ((char**)buf->elts)[i];
|
||
if(s)
|
||
fprintf(out, "%s", s);
|
||
}
|
||
return buf;
|
||
}
|
||
|
||
/* Append a "%s" formatted string to a string buffer */
|
||
struct Buf *buf_prints (struct Buf *buf, const char *fmt, const char *s)
|
||
{
|
||
char *t;
|
||
size_t tsz;
|
||
|
||
t = flex_alloc (tsz = strlen (fmt) + strlen (s) + 1);
|
||
if (!t)
|
||
flexfatal (_("Allocation of buffer to print string failed"));
|
||
snprintf (t, tsz, fmt, s);
|
||
buf = buf_strappend (buf, t);
|
||
flex_free (t);
|
||
return buf;
|
||
}
|
||
|
||
/** Append a line directive to the string buffer.
|
||
* @param buf A string buffer.
|
||
* @param filename file name
|
||
* @param lineno line number
|
||
* @return buf
|
||
*/
|
||
struct Buf *buf_linedir (struct Buf *buf, const char* filename, int lineno)
|
||
{
|
||
char *dst, *t;
|
||
const char *src;
|
||
|
||
t = flex_alloc (strlen ("#line \"\"\n") + /* constant parts */
|
||
2 * strlen (filename) + /* filename with possibly all backslashes escaped */
|
||
NUMCHARLINES + /* line number */
|
||
1); /* NUL */
|
||
if (!t)
|
||
flexfatal (_("Allocation of buffer for line directive failed"));
|
||
for (dst = t + sprintf (t, "#line %d \"", lineno), src = filename; *src; *dst++ = *src++)
|
||
if (*src == '\\') /* escape backslashes */
|
||
*dst++ = '\\';
|
||
*dst++ = '"';
|
||
*dst++ = '\n';
|
||
*dst = '\0';
|
||
buf = buf_strappend (buf, t);
|
||
flex_free (t);
|
||
return buf;
|
||
}
|
||
|
||
|
||
/** Append the contents of @a src to @a dest.
|
||
* @param @a dest the destination buffer
|
||
* @param @a dest the source buffer
|
||
* @return @a dest
|
||
*/
|
||
struct Buf *buf_concat(struct Buf* dest, const struct Buf* src)
|
||
{
|
||
buf_append(dest, src->elts, src->nelts);
|
||
return dest;
|
||
}
|
||
|
||
|
||
/* Appends n characters in str to buf. */
|
||
struct Buf *buf_strnappend (buf, str, n)
|
||
struct Buf *buf;
|
||
const char *str;
|
||
int n;
|
||
{
|
||
buf_append (buf, str, n + 1);
|
||
|
||
/* "undo" the '\0' character that buf_append() already copied. */
|
||
buf->nelts--;
|
||
|
||
return buf;
|
||
}
|
||
|
||
/* Appends characters in str to buf. */
|
||
struct Buf *buf_strappend (buf, str)
|
||
struct Buf *buf;
|
||
const char *str;
|
||
{
|
||
return buf_strnappend (buf, str, strlen (str));
|
||
}
|
||
|
||
/* appends "#define str def\n" */
|
||
struct Buf *buf_strdefine (buf, str, def)
|
||
struct Buf *buf;
|
||
const char *str;
|
||
const char *def;
|
||
{
|
||
buf_strappend (buf, "#define ");
|
||
buf_strappend (buf, " ");
|
||
buf_strappend (buf, str);
|
||
buf_strappend (buf, " ");
|
||
buf_strappend (buf, def);
|
||
buf_strappend (buf, "\n");
|
||
return buf;
|
||
}
|
||
|
||
/** Pushes "m4_define( [[def]], [[val]])m4_dnl" to end of buffer.
|
||
* @param buf A buffer as a list of strings.
|
||
* @param def The m4 symbol to define.
|
||
* @param val The definition; may be NULL.
|
||
* @return buf
|
||
*/
|
||
struct Buf *buf_m4_define (struct Buf *buf, const char* def, const char* val)
|
||
{
|
||
const char * fmt = "m4_define( [[%s]], [[%s]])m4_dnl\n";
|
||
char * str;
|
||
size_t strsz;
|
||
|
||
val = val?val:"";
|
||
str = (char*)flex_alloc(strsz = strlen(fmt) + strlen(def) + strlen(val) + 2);
|
||
if (!str)
|
||
flexfatal (_("Allocation of buffer for m4 def failed"));
|
||
|
||
snprintf(str, strsz, fmt, def, val);
|
||
buf_append(buf, &str, 1);
|
||
return buf;
|
||
}
|
||
|
||
/** Pushes "m4_undefine([[def]])m4_dnl" to end of buffer.
|
||
* @param buf A buffer as a list of strings.
|
||
* @param def The m4 symbol to undefine.
|
||
* @return buf
|
||
*/
|
||
struct Buf *buf_m4_undefine (struct Buf *buf, const char* def)
|
||
{
|
||
const char * fmt = "m4_undefine( [[%s]])m4_dnl\n";
|
||
char * str;
|
||
size_t strsz;
|
||
|
||
str = (char*)flex_alloc(strsz = strlen(fmt) + strlen(def) + 2);
|
||
if (!str)
|
||
flexfatal (_("Allocation of buffer for m4 undef failed"));
|
||
|
||
snprintf(str, strsz, fmt, def);
|
||
buf_append(buf, &str, 1);
|
||
return buf;
|
||
}
|
||
|
||
/* create buf with 0 elements, each of size elem_size. */
|
||
void buf_init (buf, elem_size)
|
||
struct Buf *buf;
|
||
size_t elem_size;
|
||
{
|
||
buf->elts = (void *) 0;
|
||
buf->nelts = 0;
|
||
buf->elt_size = elem_size;
|
||
buf->nmax = 0;
|
||
}
|
||
|
||
/* frees memory */
|
||
void buf_destroy (buf)
|
||
struct Buf *buf;
|
||
{
|
||
if (buf && buf->elts)
|
||
flex_free (buf->elts);
|
||
buf->elts = (void *) 0;
|
||
}
|
||
|
||
|
||
/* appends ptr[] to buf, grow if necessary.
|
||
* n_elem is number of elements in ptr[], NOT bytes.
|
||
* returns buf.
|
||
* We grow by mod(512) boundaries.
|
||
*/
|
||
|
||
struct Buf *buf_append (buf, ptr, n_elem)
|
||
struct Buf *buf;
|
||
const void *ptr;
|
||
int n_elem;
|
||
{
|
||
int n_alloc = 0;
|
||
|
||
if (!ptr || n_elem == 0)
|
||
return buf;
|
||
|
||
/* May need to alloc more. */
|
||
if (n_elem + buf->nelts > buf->nmax) {
|
||
|
||
/* exact amount needed... */
|
||
n_alloc = (n_elem + buf->nelts) * buf->elt_size;
|
||
|
||
/* ...plus some extra */
|
||
if (((n_alloc * buf->elt_size) % 512) != 0
|
||
&& buf->elt_size < 512)
|
||
n_alloc +=
|
||
(512 -
|
||
((n_alloc * buf->elt_size) % 512)) /
|
||
buf->elt_size;
|
||
|
||
if (!buf->elts)
|
||
buf->elts =
|
||
allocate_array (n_alloc, buf->elt_size);
|
||
else
|
||
buf->elts =
|
||
reallocate_array (buf->elts, n_alloc,
|
||
buf->elt_size);
|
||
|
||
buf->nmax = n_alloc;
|
||
}
|
||
|
||
memcpy ((char *) buf->elts + buf->nelts * buf->elt_size, ptr,
|
||
n_elem * buf->elt_size);
|
||
buf->nelts += n_elem;
|
||
|
||
return buf;
|
||
}
|
||
|
||
/* vim:set tabstop=8 softtabstop=4 shiftwidth=4: */
|