1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/config/pathsub.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,215 @@
1.4 +/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +/*
1.9 +** Pathname subroutines.
1.10 +**
1.11 +** Brendan Eich, 8/29/95
1.12 +*/
1.13 +#include <assert.h>
1.14 +#include <sys/types.h>
1.15 +#include <dirent.h>
1.16 +#include <errno.h>
1.17 +#include <stdarg.h>
1.18 +#include <stdio.h>
1.19 +#include <stdlib.h>
1.20 +#include <string.h>
1.21 +#include <unistd.h>
1.22 +#include <sys/stat.h>
1.23 +#include "pathsub.h"
1.24 +
1.25 +#ifdef USE_REENTRANT_LIBC
1.26 +#include <libc_r.h>
1.27 +#endif
1.28 +
1.29 +#ifdef SUNOS4
1.30 +#include "sunos4.h"
1.31 +#endif
1.32 +
1.33 +#ifndef D_INO
1.34 +#define D_INO d_ino
1.35 +#endif
1.36 +
1.37 +char *program;
1.38 +
1.39 +void
1.40 +fail(char *format, ...)
1.41 +{
1.42 + int error;
1.43 + va_list ap;
1.44 +
1.45 +#ifdef USE_REENTRANT_LIBC
1.46 + R_STRERROR_INIT_R();
1.47 +#endif
1.48 +
1.49 + error = errno;
1.50 + fprintf(stderr, "%s: ", program);
1.51 + va_start(ap, format);
1.52 + vfprintf(stderr, format, ap);
1.53 + va_end(ap);
1.54 + if (error) {
1.55 +
1.56 +#ifdef USE_REENTRANT_LIBC
1.57 + R_STRERROR_R(errno);
1.58 + fprintf(stderr, ": %s", r_strerror_r);
1.59 +#else
1.60 + fprintf(stderr, ": %s", strerror(errno));
1.61 +#endif
1.62 + }
1.63 +
1.64 + putc('\n', stderr);
1.65 + exit(1);
1.66 +}
1.67 +
1.68 +char *
1.69 +getcomponent(char *path, char *name)
1.70 +{
1.71 + if (*path == '\0')
1.72 + return 0;
1.73 + if (*path == '/') {
1.74 + *name++ = '/';
1.75 + } else {
1.76 + do {
1.77 + *name++ = *path++;
1.78 + } while (*path != '/' && *path != '\0');
1.79 + }
1.80 + *name = '\0';
1.81 + while (*path == '/')
1.82 + path++;
1.83 + return path;
1.84 +}
1.85 +
1.86 +#ifdef LAME_READDIR
1.87 +#include <sys/param.h>
1.88 +/*
1.89 +** The static buffer in Unixware's readdir is too small.
1.90 +*/
1.91 +struct dirent *readdir(DIR *d)
1.92 +{
1.93 + static struct dirent *buf = NULL;
1.94 +
1.95 + if(buf == NULL)
1.96 + buf = (struct dirent *) malloc(sizeof(struct dirent) + MAXPATHLEN);
1.97 + return(readdir_r(d, buf));
1.98 +}
1.99 +#endif
1.100 +
1.101 +char *
1.102 +ino2name(ino_t ino)
1.103 +{
1.104 + DIR *dp;
1.105 + struct dirent *ep;
1.106 + char *name;
1.107 +
1.108 + dp = opendir("..");
1.109 + if (!dp)
1.110 + fail("cannot read parent directory");
1.111 + for (;;) {
1.112 + if (!(ep = readdir(dp)))
1.113 + fail("cannot find current directory");
1.114 + if (ep->D_INO == ino)
1.115 + break;
1.116 + }
1.117 + name = xstrdup(ep->d_name);
1.118 + closedir(dp);
1.119 + return name;
1.120 +}
1.121 +
1.122 +void *
1.123 +xmalloc(size_t size)
1.124 +{
1.125 + void *p = malloc(size);
1.126 + if (!p)
1.127 + fail("cannot allocate %u bytes", size);
1.128 + return p;
1.129 +}
1.130 +
1.131 +char *
1.132 +xstrdup(char *s)
1.133 +{
1.134 + return strcpy(xmalloc(strlen(s) + 1), s);
1.135 +}
1.136 +
1.137 +char *
1.138 +xbasename(char *path)
1.139 +{
1.140 + char *cp;
1.141 +
1.142 + while ((cp = strrchr(path, '/')) && cp[1] == '\0')
1.143 + *cp = '\0';
1.144 + if (!cp) return path;
1.145 + return cp + 1;
1.146 +}
1.147 +
1.148 +void
1.149 +xchdir(char *dir)
1.150 +{
1.151 + if (chdir(dir) < 0)
1.152 + fail("cannot change directory to %s", dir);
1.153 +}
1.154 +
1.155 +int
1.156 +relatepaths(char *from, char *to, char *outpath)
1.157 +{
1.158 + char *cp, *cp2;
1.159 + int len;
1.160 + char buf[NAME_MAX];
1.161 +
1.162 + assert(*from == '/' && *to == '/');
1.163 + for (cp = to, cp2 = from; *cp == *cp2; cp++, cp2++)
1.164 + if (*cp == '\0')
1.165 + break;
1.166 + while (cp[-1] != '/')
1.167 + cp--, cp2--;
1.168 + if (cp - 1 == to) {
1.169 + /* closest common ancestor is /, so use full pathname */
1.170 + len = strlen(strcpy(outpath, to));
1.171 + if (outpath[len] != '/') {
1.172 + outpath[len++] = '/';
1.173 + outpath[len] = '\0';
1.174 + }
1.175 + } else {
1.176 + len = 0;
1.177 + while ((cp2 = getcomponent(cp2, buf)) != 0) {
1.178 + strcpy(outpath + len, "../");
1.179 + len += 3;
1.180 + }
1.181 + while ((cp = getcomponent(cp, buf)) != 0) {
1.182 + sprintf(outpath + len, "%s/", buf);
1.183 + len += strlen(outpath + len);
1.184 + }
1.185 + }
1.186 + return len;
1.187 +}
1.188 +
1.189 +void
1.190 +reversepath(char *inpath, char *name, int len, char *outpath)
1.191 +{
1.192 + char *cp, *cp2;
1.193 + char buf[NAME_MAX];
1.194 + struct stat sb;
1.195 +
1.196 + cp = strcpy(outpath + PATH_MAX - (len + 1), name);
1.197 + cp2 = inpath;
1.198 + while ((cp2 = getcomponent(cp2, buf)) != 0) {
1.199 + if (strcmp(buf, ".") == 0)
1.200 + continue;
1.201 + if (strcmp(buf, "..") == 0) {
1.202 + if (stat(".", &sb) < 0)
1.203 + fail("cannot stat current directory");
1.204 + name = ino2name(sb.st_ino);
1.205 + len = strlen(name);
1.206 + cp -= len + 1;
1.207 + strcpy(cp, name);
1.208 + cp[len] = '/';
1.209 + free(name);
1.210 + xchdir("..");
1.211 + } else {
1.212 + cp -= 3;
1.213 + strncpy(cp, "../", 3);
1.214 + xchdir(buf);
1.215 + }
1.216 + }
1.217 + strcpy(outpath, cp);
1.218 +}
