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authorJerzi Kaminsky <JerziKaminsky@users.noreply.github.com>2017-04-14 23:37:43 +0300
committerJerzi Kaminsky <JerziKaminsky@users.noreply.github.com>2017-04-16 17:09:53 +0300
commitc9694ee63d451da62dc50b234b3080a35a40e844 (patch)
treecb826b8dba53c28dff9b1c440007e1b21a6fba5e
parentbcf9338ce7dec6c83564c92567d14443d0467806 (diff)
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Add resolve_path() to utils
-rw-r--r--common/util.c41
-rw-r--r--include/util.h8
2 files changed, 49 insertions, 0 deletions
diff --git a/common/util.c b/common/util.c
index 12ed0cd..a9e6a9c 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 839af26..e536545 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