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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
/*
** Pathname subroutines.
**
** Brendan Eich, 8/29/95
*/
#include <assert.h>
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include "pathsub.h"
#ifdef USE_REENTRANT_LIBC
# include <libc_r.h>
#endif
#ifdef SUNOS4
# include "sunos4.h"
#endif
char* program;
void fail(const char* format, ...) {
int error;
va_list ap;
#ifdef USE_REENTRANT_LIBC
R_STRERROR_INIT_R();
#endif
error = errno;
fprintf(stderr, "%s: ", program);
va_start(ap, format);
vfprintf(stderr, format, ap);
va_end(ap);
if (error) {
#ifdef USE_REENTRANT_LIBC
R_STRERROR_R(errno);
fprintf(stderr, ": %s", r_strerror_r);
#else
fprintf(stderr, ": %s", strerror(errno));
#endif
}
putc('\n', stderr);
exit(1);
}
char* getcomponent(char* path, char* name) {
if (*path == '\0') return 0;
if (*path == '/') {
*name++ = '/';
} else {
do {
*name++ = *path++;
} while (*path != '/' && *path != '\0');
}
*name = '\0';
while (*path == '/') path++;
return path;
}
#ifdef LAME_READDIR
# include <sys/param.h>
/*
** The static buffer in Unixware's readdir is too small.
*/
struct dirent* readdir(DIR* d) {
static struct dirent* buf = NULL;
if (buf == NULL)
buf = (struct dirent*)malloc(sizeof(struct dirent) + MAXPATHLEN);
return (readdir_r(d, buf));
}
#endif
char* ino2name(ino_t ino) {
DIR* dp;
struct dirent* ep;
char* name;
dp = opendir("..");
if (!dp) fail("cannot read parent directory");
for (;;) {
if (!(ep = readdir(dp))) fail("cannot find current directory");
if (ep->d_ino == ino) break;
}
name = xstrdup(ep->d_name);
closedir(dp);
return name;
}
void* xmalloc(size_t size) {
void* p = malloc(size);
if (!p) fail("cannot allocate %u bytes", size);
return p;
}
char* xstrdup(char* s) { return strcpy(xmalloc(strlen(s) + 1), s); }
char* xbasename(char* path) {
char* cp;
while ((cp = strrchr(path, '/')) && cp[1] == '\0') *cp = '\0';
if (!cp) return path;
return cp + 1;
}
void xchdir(const char* dir) {
if (chdir(dir) < 0) fail("cannot change directory to %s", dir);
}
int relatepaths(char* from, char* to, char* outpath) {
char *cp, *cp2;
int len;
char buf[NAME_MAX];
assert(*from == '/' && *to == '/');
for (cp = to, cp2 = from; *cp == *cp2; cp++, cp2++)
if (*cp == '\0') break;
while (cp[-1] != '/') cp--, cp2--;
if (cp - 1 == to) {
/* closest common ancestor is /, so use full pathname */
len = strlen(strcpy(outpath, to));
if (outpath[len] != '/') {
outpath[len++] = '/';
outpath[len] = '\0';
}
} else {
len = 0;
while ((cp2 = getcomponent(cp2, buf)) != 0) {
strcpy(outpath + len, "../");
len += 3;
}
while ((cp = getcomponent(cp, buf)) != 0) {
sprintf(outpath + len, "%s/", buf);
len += strlen(outpath + len);
}
}
return len;
}
void reversepath(char* inpath, char* name, int len, char* outpath) {
char *cp, *cp2;
char buf[NAME_MAX];
struct stat sb;
cp = strcpy(outpath + PATH_MAX - (len + 1), name);
cp2 = inpath;
while ((cp2 = getcomponent(cp2, buf)) != 0) {
if (strcmp(buf, ".") == 0) continue;
if (strcmp(buf, "..") == 0) {
if (stat(".", &sb) < 0) fail("cannot stat current directory");
name = ino2name(sb.st_ino);
len = strlen(name);
cp -= len + 1;
strcpy(cp, name);
cp[len] = '/';
free(name);
xchdir("..");
} else {
cp -= 3;
strncpy(cp, "../", 3);
xchdir(buf);
}
}
strcpy(outpath, cp);
}