move files around

[project/fstools.git] / libfstools / find.c

diff --git a/libfstools/find.c b/libfstools/find.c
new file mode 100644 (file)
index 0000000..35e37e7
--- /dev/null
+++ b/libfstools/find.c
@@ -0,0 +1,135 @@
+/*
+ * Copyright (C) 2014 John Crispin <blogic@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "../fs-state.h"
+
+int
+find_overlay_mount(char *overlay)
+{
+       FILE *fp = fopen("/proc/mounts", "r");
+       static char line[256];
+       int ret = -1;
+
+       if(!fp)
+               return ret;
+
+       while (ret && fgets(line, sizeof(line), fp))
+               if (!strncmp(line, overlay, strlen(overlay)))
+                       ret = 0;
+
+       fclose(fp);
+
+       return ret;
+}
+
+char*
+find_mount(char *mp)
+{
+       FILE *fp = fopen("/proc/mounts", "r");
+       static char line[256];
+       char *point = NULL;
+
+       if(!fp)
+               return NULL;
+
+       while (fgets(line, sizeof(line), fp)) {
+               char *s, *t = strstr(line, " ");
+
+               if (!t) {
+                       fclose(fp);
+                       return NULL;
+               }
+               t++;
+               s = strstr(t, " ");
+               if (!s) {
+                       fclose(fp);
+                       return NULL;
+               }
+               *s = '\0';
+
+               if (!strcmp(t, mp)) {
+                       fclose(fp);
+                       return t;
+               }
+       }
+
+       fclose(fp);
+
+       return point;
+}
+
+char*
+find_mount_point(char *block, char *fs)
+{
+       FILE *fp = fopen("/proc/mounts", "r");
+       static char line[256];
+       int len = strlen(block);
+       char *point = NULL;
+
+       if(!fp)
+               return NULL;
+
+       while (fgets(line, sizeof(line), fp)) {
+               if (!strncmp(line, block, len)) {
+                       char *p = &line[len + 1];
+                       char *t = strstr(p, " ");
+
+                       if (!t) {
+                               fclose(fp);
+                               return NULL;
+                       }
+
+                       *t = '\0';
+                       t++;
+
+                       if (fs && strncmp(t, fs, strlen(fs))) {
+                               fclose(fp);
+                               fprintf(stderr, "block is mounted with wrong fs\n");
+                               return NULL;
+                       }
+                       point = p;
+
+                       break;
+               }
+       }
+
+       fclose(fp);
+
+       return point;
+}
+
+int
+find_filesystem(char *fs)
+{
+       FILE *fp = fopen("/proc/filesystems", "r");
+       static char line[256];
+       int ret = -1;
+
+       if (!fp) {
+               fprintf(stderr, "opening /proc/filesystems failed: %s\n", strerror(errno));
+               goto out;
+       }
+
+       while (ret && fgets(line, sizeof(line), fp))
+               if (strstr(line, fs))
+                       ret = 0;
+
+       fclose(fp);
+
+out:
+       return ret;
+}