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Viewing changes to tools/perf/util/abspath.c

  • Committer: Bazaar Package Importer
  • Author(s): Amit Kucheria, Amit Kucheria
  • Date: 2010-03-10 02:28:15 UTC
  • Revision ID: james.westby@ubuntu.com-20100310022815-7sd3gwvn5kenaq33
Tags: 2.6.33-500.1
[ Amit Kucheria ]

* Initial release of a 2.6.33-based OMAP kernel
* UBUNTU: [Upstream] Fix omap 1-wire driver compilation
* UBUNTU: ubuntu: AppArmor -- update to mainline 2010-03-04

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Lines of Context:
tools/perf/util/abspath.c
 
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#include "cache.h"
 
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/*
 
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 * Do not use this for inspecting *tracked* content.  When path is a
 
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 * symlink to a directory, we do not want to say it is a directory when
 
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 * dealing with tracked content in the working tree.
 
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 */
 
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static int is_directory(const char *path)
 
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{
 
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        struct stat st;
 
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        return (!stat(path, &st) && S_ISDIR(st.st_mode));
 
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}
 
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/* We allow "recursive" symbolic links. Only within reason, though. */
 
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#define MAXDEPTH 5
 
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const char *make_absolute_path(const char *path)
 
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{
 
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        static char bufs[2][PATH_MAX + 1], *buf = bufs[0], *next_buf = bufs[1];
 
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        char cwd[1024] = "";
 
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        int buf_index = 1, len;
 
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        int depth = MAXDEPTH;
 
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        char *last_elem = NULL;
 
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        struct stat st;
 
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        if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
 
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                die ("Too long path: %.*s", 60, path);
 
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        while (depth--) {
 
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                if (!is_directory(buf)) {
 
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                        char *last_slash = strrchr(buf, '/');
 
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                        if (last_slash) {
 
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                                *last_slash = '\0';
 
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                                last_elem = xstrdup(last_slash + 1);
 
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                        } else {
 
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                                last_elem = xstrdup(buf);
 
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                                *buf = '\0';
 
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                        }
 
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                }
 
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                if (*buf) {
 
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                        if (!*cwd && !getcwd(cwd, sizeof(cwd)))
 
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                                die ("Could not get current working directory");
 
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                        if (chdir(buf))
 
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                                die ("Could not switch to '%s'", buf);
 
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                }
 
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                if (!getcwd(buf, PATH_MAX))
 
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                        die ("Could not get current working directory");
 
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                if (last_elem) {
 
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                        len = strlen(buf);
 
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                        if (len + strlen(last_elem) + 2 > PATH_MAX)
 
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                                die ("Too long path name: '%s/%s'",
 
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                                                buf, last_elem);
 
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                        buf[len] = '/';
 
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                        strcpy(buf + len + 1, last_elem);
 
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                        free(last_elem);
 
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                        last_elem = NULL;
 
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                }
 
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                if (!lstat(buf, &st) && S_ISLNK(st.st_mode)) {
 
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                        len = readlink(buf, next_buf, PATH_MAX);
 
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                        if (len < 0)
 
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                                die ("Invalid symlink: %s", buf);
 
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                        if (PATH_MAX <= len)
 
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                                die("symbolic link too long: %s", buf);
 
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                        next_buf[len] = '\0';
 
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                        buf = next_buf;
 
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                        buf_index = 1 - buf_index;
 
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                        next_buf = bufs[buf_index];
 
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                } else
 
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                        break;
 
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        }
 
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        if (*cwd && chdir(cwd))
 
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                die ("Could not change back to '%s'", cwd);
 
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        return buf;
 
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}
 
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static const char *get_pwd_cwd(void)
 
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{
 
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        static char cwd[PATH_MAX + 1];
 
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        char *pwd;
 
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        struct stat cwd_stat, pwd_stat;
 
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        if (getcwd(cwd, PATH_MAX) == NULL)
 
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                return NULL;
 
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        pwd = getenv("PWD");
 
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        if (pwd && strcmp(pwd, cwd)) {
 
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                stat(cwd, &cwd_stat);
 
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                if (!stat(pwd, &pwd_stat) &&
 
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                    pwd_stat.st_dev == cwd_stat.st_dev &&
 
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                    pwd_stat.st_ino == cwd_stat.st_ino) {
 
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                        strlcpy(cwd, pwd, PATH_MAX);
 
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                }
 
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        }
 
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        return cwd;
 
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}
 
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const char *make_nonrelative_path(const char *path)
 
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{
 
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        static char buf[PATH_MAX + 1];
 
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        if (is_absolute_path(path)) {
 
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                if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
 
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                        die("Too long path: %.*s", 60, path);
 
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        } else {
 
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                const char *cwd = get_pwd_cwd();
 
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                if (!cwd)
 
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                        die("Cannot determine the current working directory");
 
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                if (snprintf(buf, PATH_MAX, "%s/%s", cwd, path) >= PATH_MAX)
 
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                        die("Too long path: %.*s", 60, path);
 
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        }
 
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        return buf;
 
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}