1 files changed, 177 insertions, 0 deletions
diff --git a/config/pathsub.c b/config/pathsub.c
new file mode 100644
index 0000000000..cac00d95fe
--- /dev/null
+++ b/config/pathsub.c
@@ -0,0 +1,177 @@
+/* -*- 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
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+/*
+** 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);
+}