Use one generic routine to access /proc/cmdline

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

diff --git a/utils/utils.c b/utils/utils.c
index 59d02f1..5e67310 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 +126,39 @@ 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 pattern[COMMAND_LINE_SIZE + 1];
+       char line[COMMAND_LINE_SIZE + 1];
+       char *res = NULL, *tty;
+       int r, fd;
+       regex_t pat_cmdline;
+       regmatch_t matches[2];
+
+       fd = open("/proc/cmdline", O_RDONLY);
+       if (fd < 0)
+               return NULL;
+
+       r = read(fd, line, COMMAND_LINE_SIZE);
+       if ( r <= 0 ) {
+               close(fd);
+               return NULL;
+       }
+       line[r] = '\0';
+       close(fd);
+
+       sprintf( pattern, "%s=([^ \n]*)", name);
+    regcomp(&pat_cmdline, pattern, REG_EXTENDED);
+    if (!regexec(&pat_cmdline, line, 2, matches, 0)) {
+       line[matches[1].rm_eo] = '\0';
+               tty = (line + matches[1].rm_so);
+               strncpy(out, tty, len);
+               tty[len-1] = '\0';
+               res = out;
+       }
+
+    regfree(&pat_cmdline);
+
+       return res;
+}