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freebsd/usr.bin/whereis/whereis.c
Stefan Farfeleder 6c97c3d1d3 Remove unused variables.
2005-04-09 14:31:41 +00:00

674 lines
15 KiB
C
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/*
* Copyright © 2002, Jörg Wunsch
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* 4.3BSD UI-compatible whereis(1) utility. Rewritten from scratch
* since the original 4.3BSD version suffers legal problems that
* prevent it from being redistributed, and since the 4.4BSD version
* was pretty inferior in functionality.
*/
#include <sys/types.h>
__FBSDID("$FreeBSD$");
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <locale.h>
#include <regex.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#include "pathnames.h"
#define NO_BIN_FOUND 1
#define NO_MAN_FOUND 2
#define NO_SRC_FOUND 4
typedef const char *ccharp;
int opt_a, opt_b, opt_m, opt_q, opt_s, opt_u, opt_x;
ccharp *bindirs, *mandirs, *sourcedirs;
char **query;
const char *sourcepath = PATH_SOURCES;
char *colonify(ccharp *);
int contains(ccharp *, const char *);
void decolonify(char *, ccharp **, int *);
void defaults(void);
void scanopts(int, char **);
void usage(void);
/*
* Throughout this program, a number of strings are dynamically
* allocated but never freed. Their memory is written to when
* splitting the strings into string lists which will later be
* processed. Since it's important that those string lists remain
* valid even after the functions allocating the memory returned,
* those functions cannot free them. They could be freed only at end
* of main(), which is pretty pointless anyway.
*
* The overall amount of memory to be allocated for processing the
* strings is not expected to exceed a few kilobytes. For that
* reason, allocation can usually always be assumed to succeed (within
* a virtual memory environment), thus we simply bail out using
* abort(3) in case of an allocation failure.
*/
void
usage(void)
{
(void)fprintf(stderr,
"usage: whereis [-abmqsux] [-BMS dir ... -f] program ...\n");
exit(EX_USAGE);
}
/*
* Scan options passed to program.
*
* Note that the -B/-M/-S options expect a list of directory
* names that must be terminated with -f.
*/
void
scanopts(int argc, char **argv)
{
int c, i;
ccharp **dirlist;
while ((c = getopt(argc, argv, "BMSabfmqsux")) != -1)
switch (c) {
case 'B':
dirlist = &bindirs;
goto dolist;
case 'M':
dirlist = &mandirs;
goto dolist;
case 'S':
dirlist = &sourcedirs;
dolist:
i = 0;
*dirlist = realloc(*dirlist, (i + 1) * sizeof(char *));
(*dirlist)[i] = NULL;
while (optind < argc &&
strcmp(argv[optind], "-f") != 0 &&
strcmp(argv[optind], "-B") != 0 &&
strcmp(argv[optind], "-M") != 0 &&
strcmp(argv[optind], "-S") != 0) {
decolonify(argv[optind], dirlist, &i);
optind++;
}
break;
case 'a':
opt_a = 1;
break;
case 'b':
opt_b = 1;
break;
case 'f':
goto breakout;
case 'm':
opt_m = 1;
break;
case 'q':
opt_q = 1;
break;
case 's':
opt_s = 1;
break;
case 'u':
opt_u = 1;
break;
case 'x':
opt_x = 1;
break;
default:
usage();
}
breakout:
if (optind == argc)
usage();
query = argv + optind;
}
/*
* Find out whether string `s' is contained in list `cpp'.
*/
int
contains(ccharp *cpp, const char *s)
{
ccharp cp;
if (cpp == NULL)
return (0);
while ((cp = *cpp) != NULL) {
if (strcmp(cp, s) == 0)
return (1);
cpp++;
}
return (0);
}
/*
* Split string `s' at colons, and pass it to the string list pointed
* to by `cppp' (which has `*ip' elements). Note that the original
* string is modified by replacing the colon with a NUL byte. The
* partial string is only added if it has a length greater than 0, and
* if it's not already contained in the string list.
*/
void
decolonify(char *s, ccharp **cppp, int *ip)
{
char *cp;
while ((cp = strchr(s, ':')), *s != '\0') {
if (cp)
*cp = '\0';
if (strlen(s) && !contains(*cppp, s)) {
*cppp = realloc(*cppp, (*ip + 2) * sizeof(char *));
if (cppp == NULL)
abort();
(*cppp)[*ip] = s;
(*cppp)[*ip + 1] = NULL;
(*ip)++;
}
if (cp)
s = cp + 1;
else
break;
}
}
/*
* Join string list `cpp' into a colon-separated string.
*/
char *
colonify(ccharp *cpp)
{
size_t s;
char *cp;
int i;
if (cpp == NULL)
return (0);
for (s = 0, i = 0; cpp[i] != NULL; i++)
s += strlen(cpp[i]) + 1;
if ((cp = malloc(s + 1)) == NULL)
abort();
for (i = 0, *cp = '\0'; cpp[i] != NULL; i++) {
strcat(cp, cpp[i]);
strcat(cp, ":");
}
cp[s - 1] = '\0'; /* eliminate last colon */
return (cp);
}
/*
* Provide defaults for all options and directory lists.
*/
void
defaults(void)
{
size_t s;
char *b, buf[BUFSIZ], *cp;
int nele;
FILE *p;
DIR *dir;
struct stat sb;
struct dirent *dirp;
/* default to -bms if none has been specified */
if (!opt_b && !opt_m && !opt_s)
opt_b = opt_m = opt_s = 1;
/* -b defaults to default path + /usr/libexec +
* /usr/games + user's path */
if (!bindirs) {
if (sysctlbyname("user.cs_path", (void *)NULL, &s,
(void *)NULL, 0) == -1)
err(EX_OSERR, "sysctlbyname(\"user.cs_path\")");
if ((b = malloc(s + 1)) == NULL)
abort();
if (sysctlbyname("user.cs_path", b, &s, (void *)NULL, 0) == -1)
err(EX_OSERR, "sysctlbyname(\"user.cs_path\")");
nele = 0;
decolonify(b, &bindirs, &nele);
bindirs = realloc(bindirs, (nele + 3) * sizeof(char *));
if (bindirs == NULL)
abort();
bindirs[nele++] = PATH_LIBEXEC;
bindirs[nele++] = PATH_GAMES;
bindirs[nele] = NULL;
if ((cp = getenv("PATH")) != NULL) {
/* don't destroy the original environment... */
if ((b = malloc(strlen(cp) + 1)) == NULL)
abort();
strcpy(b, cp);
decolonify(b, &bindirs, &nele);
}
}
/* -m defaults to $(manpath) */
if (!mandirs) {
if ((p = popen(MANPATHCMD, "r")) == NULL)
err(EX_OSERR, "cannot execute manpath command");
if (fgets(buf, BUFSIZ - 1, p) == NULL ||
pclose(p))
err(EX_OSERR, "error processing manpath results");
if ((b = strchr(buf, '\n')) != NULL)
*b = '\0';
if ((b = malloc(strlen(buf) + 1)) == NULL)
abort();
strcpy(b, buf);
nele = 0;
decolonify(b, &mandirs, &nele);
}
/* -s defaults to precompiled list, plus subdirs of /usr/ports */
if (!sourcedirs) {
if ((b = malloc(strlen(sourcepath) + 1)) == NULL)
abort();
strcpy(b, sourcepath);
nele = 0;
decolonify(b, &sourcedirs, &nele);
if (stat(PATH_PORTS, &sb) == -1) {
if (errno == ENOENT)
/* no /usr/ports, we are done */
return;
err(EX_OSERR, "stat(" PATH_PORTS ")");
}
if ((sb.st_mode & S_IFMT) != S_IFDIR)
/* /usr/ports is not a directory, ignore */
return;
if (access(PATH_PORTS, R_OK | X_OK) != 0)
return;
if ((dir = opendir(PATH_PORTS)) == NULL)
err(EX_OSERR, "opendir" PATH_PORTS ")");
while ((dirp = readdir(dir)) != NULL) {
if (dirp->d_name[0] == '.' ||
strcmp(dirp->d_name, "CVS") == 0)
/* ignore dot entries and CVS subdir */
continue;
if ((b = malloc(sizeof PATH_PORTS + 1 + dirp->d_namlen))
== NULL)
abort();
strcpy(b, PATH_PORTS);
strcat(b, "/");
strcat(b, dirp->d_name);
if (stat(b, &sb) == -1 ||
(sb.st_mode & S_IFMT) != S_IFDIR ||
access(b, R_OK | X_OK) != 0) {
free(b);
continue;
}
sourcedirs = realloc(sourcedirs,
(nele + 2) * sizeof(char *));
if (sourcedirs == NULL)
abort();
sourcedirs[nele++] = b;
sourcedirs[nele] = NULL;
}
closedir(dir);
}
}
int
main(int argc, char **argv)
{
int unusual, i, printed;
char *bin, buf[BUFSIZ], *cp, *cp2, *man, *name, *src;
ccharp *dp;
size_t nlen, olen, s;
struct stat sb;
regex_t re, re2;
regmatch_t matches[2];
regoff_t rlen;
FILE *p;
setlocale(LC_ALL, "");
scanopts(argc, argv);
defaults();
if (mandirs == NULL)
opt_m = 0;
if (bindirs == NULL)
opt_b = 0;
if (sourcedirs == NULL)
opt_s = 0;
if (opt_m + opt_b + opt_s == 0)
errx(EX_DATAERR, "no directories to search");
if (opt_m) {
setenv("MANPATH", colonify(mandirs), 1);
if ((i = regcomp(&re, MANWHEREISMATCH, REG_EXTENDED)) != 0) {
regerror(i, &re, buf, BUFSIZ - 1);
errx(EX_UNAVAILABLE, "regcomp(%s) failed: %s",
MANWHEREISMATCH, buf);
}
}
for (; (name = *query) != NULL; query++) {
/* strip leading path name component */
if ((cp = strrchr(name, '/')) != NULL)
name = cp + 1;
/* strip SCCS or RCS suffix/prefix */
if (strlen(name) > 2 && strncmp(name, "s.", 2) == 0)
name += 2;
if ((s = strlen(name)) > 2 && strcmp(name + s - 2, ",v") == 0)
name[s - 2] = '\0';
/* compression suffix */
s = strlen(name);
if (s > 2 &&
(strcmp(name + s - 2, ".z") == 0 ||
strcmp(name + s - 2, ".Z") == 0))
name[s - 2] = '\0';
else if (s > 3 &&
strcmp(name + s - 3, ".gz") == 0)
name[s - 3] = '\0';
else if (s > 4 &&
strcmp(name + s - 4, ".bz2") == 0)
name[s - 4] = '\0';
unusual = 0;
bin = man = src = NULL;
s = strlen(name);
if (opt_b) {
/*
* Binaries have to match exactly, and must be regular
* executable files.
*/
unusual = unusual | NO_BIN_FOUND;
for (dp = bindirs; *dp != NULL; dp++) {
cp = malloc(strlen(*dp) + 1 + s + 1);
if (cp == NULL)
abort();
strcpy(cp, *dp);
strcat(cp, "/");
strcat(cp, name);
if (stat(cp, &sb) == 0 &&
(sb.st_mode & S_IFMT) == S_IFREG &&
(sb.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))
!= 0) {
unusual = unusual & ~NO_BIN_FOUND;
if (bin == NULL) {
bin = strdup(cp);
} else {
olen = strlen(bin);
nlen = strlen(cp);
bin = realloc(bin,
olen + nlen + 2);
if (bin == 0)
abort();
strcat(bin, " ");
strcat(bin, cp);
}
if (!opt_a) {
free(cp);
break;
}
}
free(cp);
}
}
if (opt_m) {
/*
* Ask the man command to perform the search for us.
*/
unusual = unusual | NO_MAN_FOUND;
if (opt_a)
cp = malloc(sizeof MANWHEREISALLCMD - 2 + s);
else
cp = malloc(sizeof MANWHEREISCMD - 2 + s);
if (cp == NULL)
abort();
if (opt_a)
sprintf(cp, MANWHEREISALLCMD, name);
else
sprintf(cp, MANWHEREISCMD, name);
if ((p = popen(cp, "r")) != NULL) {
while (fgets(buf, BUFSIZ - 1, p) != NULL) {
unusual = unusual & ~NO_MAN_FOUND;
if ((cp2 = strchr(buf, '\n')) != NULL)
*cp2 = '\0';
if (regexec(&re, buf, 2,
matches, 0) == 0 &&
(rlen = matches[1].rm_eo -
matches[1].rm_so) > 0) {
/*
* man -w found formated
* page, need to pick up
* source page name.
*/
cp2 = malloc(rlen + 1);
if (cp2 == NULL)
abort();
memcpy(cp2,
buf + matches[1].rm_so,
rlen);
cp2[rlen] = '\0';
} else {
/*
* man -w found plain source
* page, use it.
*/
s = strlen(buf);
cp2 = malloc(s + 1);
if (cp2 == NULL)
abort();
strcpy(cp2, buf);
}
if (man == NULL) {
man = strdup(cp2);
} else {
olen = strlen(man);
nlen = strlen(cp2);
man = realloc(man,
olen + nlen + 2);
if (man == 0)
abort();
strcat(man, " ");
strcat(man, cp2);
}
free(cp2);
if (!opt_a)
break;
}
pclose(p);
free(cp);
}
}
if (opt_s) {
/*
* Sources match if a subdir with the exact
* name is found.
*/
unusual = unusual | NO_SRC_FOUND;
for (dp = sourcedirs; *dp != NULL; dp++) {
cp = malloc(strlen(*dp) + 1 + s + 1);
if (cp == NULL)
abort();
strcpy(cp, *dp);
strcat(cp, "/");
strcat(cp, name);
if (stat(cp, &sb) == 0 &&
(sb.st_mode & S_IFMT) == S_IFDIR) {
unusual = unusual & ~NO_SRC_FOUND;
if (src == NULL) {
src = strdup(cp);
} else {
olen = strlen(src);
nlen = strlen(cp);
src = realloc(src,
olen + nlen + 2);
if (src == 0)
abort();
strcat(src, " ");
strcat(src, cp);
}
if (!opt_a) {
free(cp);
break;
}
}
free(cp);
}
/*
* If still not found, ask locate to search it
* for us. This will find sources for things
* like lpr that are well hidden in the
* /usr/src tree, but takes a lot longer.
* Thus, option -x (`expensive') prevents this
* search.
*
* Do only match locate output that starts
* with one of our source directories, and at
* least one further level of subdirectories.
*/
if (opt_x || (src && !opt_a))
goto done_sources;
cp = malloc(sizeof LOCATECMD - 2 + s);
if (cp == NULL)
abort();
sprintf(cp, LOCATECMD, name);
if ((p = popen(cp, "r")) == NULL)
goto done_sources;
while ((src == NULL || opt_a) &&
(fgets(buf, BUFSIZ - 1, p)) != NULL) {
if ((cp2 = strchr(buf, '\n')) != NULL)
*cp2 = '\0';
for (dp = sourcedirs;
(src == NULL || opt_a) && *dp != NULL;
dp++) {
cp2 = malloc(strlen(*dp) + 9);
if (cp2 == NULL)
abort();
strcpy(cp2, "^");
strcat(cp2, *dp);
strcat(cp2, "/[^/]+/");
if ((i = regcomp(&re2, cp2,
REG_EXTENDED|REG_NOSUB))
!= 0) {
regerror(i, &re, buf,
BUFSIZ - 1);
errx(EX_UNAVAILABLE,
"regcomp(%s) failed: %s",
cp2, buf);
}
free(cp2);
if (regexec(&re2, buf, 0,
(regmatch_t *)NULL, 0)
== 0) {
unusual = unusual &
~NO_SRC_FOUND;
if (src == NULL) {
src = strdup(buf);
} else {
olen = strlen(src);
nlen = strlen(buf);
src = realloc(src,
olen +
nlen + 2);
if (src == 0)
abort();
strcat(src, " ");
strcat(src, buf);
}
}
regfree(&re2);
}
}
pclose(p);
free(cp);
}
done_sources:
if (opt_u && !unusual)
continue;
printed = 0;
if (!opt_q) {
printf("%s:", name);
printed++;
}
if (bin) {
if (printed++)
putchar(' ');
fputs(bin, stdout);
}
if (man) {
if (printed++)
putchar(' ');
fputs(man, stdout);
}
if (src) {
if (printed++)
putchar(' ');
fputs(src, stdout);
}
if (printed)
putchar('\n');
}
if (opt_m)
regfree(&re);
return (0);
}
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