Merge branch 'js/maint-add-path-stat-pwd'

[git.git] / abspath.c

diff --git a/abspath.c b/abspath.c
index e7d22bf60be147c2fa6731834dcd42a132eadecd..37287f86c18f8b532feb38b5c70541c8cb3d3a44 100644 (file)
--- a/abspath.c
+++ b/abspath.c
@@ -1,24 +1,46 @@
 #include "cache.h"
 
+/*
+ * Do not use this for inspecting *tracked* content.  When path is a
+ * symlink to a directory, we do not want to say it is a directory when
+ * dealing with tracked content in the working tree.
+ */
+int is_directory(const char *path)
+{
+       struct stat st;
+       return (!stat(path, &st) && S_ISDIR(st.st_mode));
+}
+
 /* We allow "recursive" symbolic links. Only within reason, though. */
 #define MAXDEPTH 5
 
-const char *make_absolute_path(const char *path)
+/*
+ * Use this to get the real path, i.e. resolve links. If you want an
+ * absolute path but don't mind links, use absolute_path.
+ *
+ * If path is our buffer, then return path, as it's already what the
+ * user wants.
+ */
+const char *real_path(const char *path)
 {
        static char bufs[2][PATH_MAX + 1], *buf = bufs[0], *next_buf = bufs[1];
        char cwd[1024] = "";
-       int buf_index = 1, len;
+       int buf_index = 1;
 
        int depth = MAXDEPTH;
        char *last_elem = NULL;
        struct stat st;
 
+       /* We've already done it */
+       if (path == buf || path == next_buf)
+               return path;
+
        if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
                die ("Too long path: %.*s", 60, path);
 
        while (depth--) {
-               if (stat(buf, &st) || !S_ISDIR(st.st_mode)) {
-                       char *last_slash = strrchr(buf, '/');
+               if (!is_directory(buf)) {
+                       char *last_slash = find_last_dir_sep(buf);
                        if (last_slash) {
                                *last_slash = '\0';
                                last_elem = xstrdup(last_slash + 1);
@@ -30,29 +52,32 @@ const char *make_absolute_path(const char *path)
 
                if (*buf) {
                        if (!*cwd && !getcwd(cwd, sizeof(cwd)))
-                               die ("Could not get current working directory");
+                               die_errno ("Could not get current working directory");
 
                        if (chdir(buf))
-                               die ("Could not switch to '%s'", buf);
+                               die_errno ("Could not switch to '%s'", buf);
                }
                if (!getcwd(buf, PATH_MAX))
-                       die ("Could not get current working directory");
+                       die_errno ("Could not get current working directory");
 
                if (last_elem) {
-                       int len = strlen(buf);
+                       size_t len = strlen(buf);
                        if (len + strlen(last_elem) + 2 > PATH_MAX)
                                die ("Too long path name: '%s/%s'",
                                                buf, last_elem);
-                       buf[len] = '/';
-                       strcpy(buf + len + 1, last_elem);
+                       if (len && !is_dir_sep(buf[len-1]))
+                               buf[len++] = '/';
+                       strcpy(buf + len, last_elem);
                        free(last_elem);
                        last_elem = NULL;
                }
 
                if (!lstat(buf, &st) && S_ISLNK(st.st_mode)) {
-                       len = readlink(buf, next_buf, PATH_MAX);
+                       ssize_t len = readlink(buf, next_buf, PATH_MAX);
                        if (len < 0)
-                               die ("Invalid symlink: %s", buf);
+                               die_errno ("Invalid symlink '%s'", buf);
+                       if (PATH_MAX <= len)
+                               die("symbolic link too long: %s", buf);
                        next_buf[len] = '\0';
                        buf = next_buf;
                        buf_index = 1 - buf_index;
@@ -62,7 +87,7 @@ const char *make_absolute_path(const char *path)
        }
 
        if (*cwd && chdir(cwd))
-               die ("Could not change back to '%s'", cwd);
+               die_errno ("Could not change back to '%s'", cwd);
 
        return buf;
 }
@@ -87,7 +112,14 @@ static const char *get_pwd_cwd(void)
        return cwd;
 }
 
-const char *make_nonrelative_path(const char *path)
+/*
+ * Use this to get an absolute path from a relative one. If you want
+ * to resolve links, you should use real_path.
+ *
+ * If the path is already absolute, then return path. As the user is
+ * never meant to free the return value, we're safe.
+ */
+const char *absolute_path(const char *path)
 {
        static char buf[PATH_MAX + 1];
 
@@ -95,10 +127,14 @@ const char *make_nonrelative_path(const char *path)
                if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
                        die("Too long path: %.*s", 60, path);
        } else {
+               size_t len;
+               const char *fmt;
                const char *cwd = get_pwd_cwd();
                if (!cwd)
-                       die("Cannot determine the current working directory");
-               if (snprintf(buf, PATH_MAX, "%s/%s", cwd, path) >= PATH_MAX)
+                       die_errno("Cannot determine the current working directory");
+               len = strlen(cwd);
+               fmt = (len > 0 && is_dir_sep(cwd[len-1])) ? "%s%s" : "%s/%s";
+               if (snprintf(buf, PATH_MAX, fmt, cwd, path) >= PATH_MAX)
                        die("Too long path: %.*s", 60, path);
        }
        return buf;