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author | Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> | 2012-08-22 18:54:50 +0800 |
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committer | Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> | 2012-09-05 03:22:13 +0800 |
commit | 2d7ac4aa33e1fcef8319ca7a0ae587f468fa26dd (patch) | |
tree | 6a4b12e0117bb94e39158dcb23495b33721cd609 /fs | |
parent | 65d4f485eb53e18d2832260ce4e56799e54fc2da (diff) | |
download | barebox-2d7ac4aa33e1fcef8319ca7a0ae587f468fa26dd.tar.gz barebox-2d7ac4aa33e1fcef8319ca7a0ae587f468fa26dd.tar.xz |
fs: implement stat
stat() stats the file pointed to by path and fills in buf.
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/fs.c | 105 |
1 files changed, 105 insertions, 0 deletions
@@ -26,6 +26,7 @@ #include <errno.h> #include <malloc.h> #include <linux/stat.h> +#include <linux/err.h> #include <fcntl.h> #include <xfuncs.h> #include <init.h> @@ -111,6 +112,61 @@ static int init_cwd(void) postcore_initcall(init_cwd); +char *normalise_link(const char *pathname, const char *symlink) +{ + const char *buf = symlink; + char *path_free, *path; + char *absolute_path; + int point = 0; + int dir = 1; + int len; + + if (symlink[0] == '/') + return strdup(symlink); + + while (*buf == '.' || *buf == '/') { + if (*buf == '.') { + point++; + } else if (*buf == '/') { + point = 0; + dir++; + } + if (point > 2) { + buf -= 2; + break; + } + buf++; + } + + path = path_free = strdup(pathname); + if (!path) + return NULL; + + while(dir) { + path = dirname(path); + dir--; + } + + len = strlen(buf) + strlen(path) + 1; + if (buf[0] != '/') + len++; + + absolute_path = calloc(sizeof(char), len); + + if (!absolute_path) + goto out; + + strcat(absolute_path, path); + if (buf[0] != '/') + strcat(absolute_path, "/"); + strcat(absolute_path, buf); + +out: + free(path_free); + + return absolute_path; +} + char *normalise_path(const char *pathname) { char *path = xzalloc(strlen(pathname) + strlen(cwd) + 2); @@ -512,6 +568,42 @@ out: } EXPORT_SYMBOL(unlink); +static char *realfile(const char *pathname, struct stat *s) +{ + char *path = normalise_path(pathname); + int ret; + + ret = lstat(path, s); + if (ret) + goto out; + + if (S_ISLNK(s->st_mode)) { + char tmp[PATH_MAX]; + char *new_path; + + memset(tmp, 0, PATH_MAX); + + ret = readlink(path, tmp, PATH_MAX - 1); + if (ret < 0) + goto out; + + new_path = normalise_link(path, tmp); + free(path); + if (!new_path) + return ERR_PTR(-ENOMEM); + path = new_path; + + ret = lstat(path, s); + } + + if (!ret) + return path; + +out: + free(path); + return ERR_PTR(ret); +} + int open(const char *pathname, int flags, ...) { struct fs_device_d *fsdev; @@ -1218,6 +1310,19 @@ int closedir(DIR *dir) } EXPORT_SYMBOL(closedir); +int stat(const char *filename, struct stat *s) +{ + char *f; + + f = realfile(filename, s); + if (IS_ERR(f)) + return PTR_ERR(f); + + free(f); + return 0; +} +EXPORT_SYMBOL(stat); + int lstat(const char *filename, struct stat *s) { struct device_d *dev; |