initd: allow overriding early PATH through build time define

[project/procd.git] / utils / utils.c

diff --git a/utils/utils.c b/utils/utils.c
index 59d02f1..c0d1cd5 100644 (file)
--- a/utils/utils.c
+++ b/utils/utils.c
@@ -15,6 +15,12 @@
 #include <libubox/avl.h>
 #include <libubox/avl-cmp.h>
 #include "utils.h"
+#include <asm-generic/setup.h>
+#include <regex.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
 
 void
 __blobmsg_list_init(struct blobmsg_list *list, int offset, int len, blobmsg_list_cmp cmp)
@@ -120,3 +126,30 @@ blobmsg_list_equal(struct blobmsg_list *l1, struct blobmsg_list *l2)
 
        return true;
 }
+
+char* get_cmdline_val(const char* name, char* out, int len)
+{
+       char line[CMDLINE_SIZE + 1], *c, *sptr;
+       int fd = open("/proc/cmdline", O_RDONLY);
+       ssize_t r = read(fd, line, sizeof(line) - 1);
+       close(fd);
+
+       if (r <= 0)
+               return NULL;
+
+       line[r] = 0;
+
+       for (c = strtok_r(line, " \t\n", &sptr); c;
+                       c = strtok_r(NULL, " \t\n", &sptr)) {
+               char *sep = strchr(c, '=');
+               ssize_t klen = sep - c;
+               if (klen < 0 || strncmp(name, c, klen) || name[klen] != 0)
+                       continue;
+
+               strncpy(out, &sep[1], len);
+               out[len-1] = 0;
+               return out;
+       }
+
+       return NULL;
+}