diff options
| -rw-r--r-- | common/util.c | 41 | ||||
| -rw-r--r-- | include/util.h | 8 |
2 files changed, 49 insertions, 0 deletions
diff --git a/common/util.c b/common/util.c index 12ed0cdc..a9e6a9c2 100644 --- a/common/util.c +++ b/common/util.c @@ -1,3 +1,7 @@ +#define _XOPEN_SOURCE 500 +#include <sys/types.h> +#include <sys/stat.h> +#include <unistd.h> #include <math.h> #include <stdint.h> #include <stdio.h> @@ -118,3 +122,40 @@ uint32_t parse_color(const char *color) { } return res; } + +char* resolve_path(const char* path) { + struct stat sb; + ssize_t r; + int i; + char *current = NULL; + char *resolved = NULL; + + if(!(current = strdup(path))) { + return NULL; + } + for (i = 0; i < 16; ++i) { + if (lstat(current, &sb) == -1) { + goto failed; + } + if((sb.st_mode & S_IFMT) != S_IFLNK) { + return current; + } + if (!(resolved = malloc(sb.st_size + 1))) { + goto failed; + } + r = readlink(current, resolved, sb.st_size); + if (r == -1 || r > sb.st_size) { + goto failed; + } + resolved[r] = '\0'; + free(current); + current = strdup(resolved); + free(resolved); + resolved = NULL; + } + +failed: + free(resolved); + free(current); + return NULL; +}
\ No newline at end of file diff --git a/include/util.h b/include/util.h index 839af265..e5365458 100644 --- a/include/util.h +++ b/include/util.h @@ -49,4 +49,12 @@ pid_t get_parent_pid(pid_t pid); */ uint32_t parse_color(const char *color); +/** + * Given a path string, recurseively resolves any symlinks to their targets + * (which may be a file, directory) and returns the result. + * argument is returned. Caller must free the returned buffer. + * If an error occures, if the path does not exist or if the path corresponds + * to a dangling symlink, NULL is returned. + */ +char* resolve_path(const char* path); #endif |