firmware-utils/trx: add relative offset parameter

[openwrt/svn-archive/archive.git] / tools / firmware-utils / src / trx.c

diff --git a/tools/firmware-utils/src/trx.c b/tools/firmware-utils/src/trx.c
index 728deac37f5171336038f4c2543afe3bc32c3bb5..44bd06a068c3e9d27a803bb3fd565b944ca16cb9 100644 (file)
--- a/tools/firmware-utils/src/trx.c
+++ b/tools/firmware-utils/src/trx.c
@@ -83,7 +83,7 @@ void usage(void) __attribute__ (( __noreturn__ ));
 void usage(void)
 {
        fprintf(stderr, "Usage:\n");
-       fprintf(stderr, " trx [-2] [-o outfile] [-m maxlen] [-a align] [-b offset] \\\n");
+       fprintf(stderr, " trx [-2] [-o outfile] [-m maxlen] [-a align] [-b absolute offset] [-x relative offset]\n");
        fprintf(stderr, "     [-f file] [-f file [-f file [-f file (v2 only)]]]\n");
        exit(EXIT_FAILURE);
 }
@@ -97,6 +97,7 @@ int main(int argc, char **argv)
        char *e;
        int c, i, append = 0;
        size_t n;
+       ssize_t n2;
        uint32_t cur_len;
        unsigned long maxlen = TRX_MAX_LEN;
        struct trx_header *p;
@@ -118,7 +119,7 @@ int main(int argc, char **argv)
        in = NULL;
        i = 0;
 
-       while ((c = getopt(argc, argv, "-:2o:m:a:b:f:A:")) != -1) {
+       while ((c = getopt(argc, argv, "-:2o:m:a:x:b:f:A:")) != -1) {
                switch (c) {
                        case '2':
                                /* take care that nothing was written to buf so far */
@@ -218,6 +219,25 @@ int main(int argc, char **argv)
                                        memset(buf + cur_len, 0, n - cur_len);
                                        cur_len = n;
                                }
+                               break;
+                       case 'x':
+                               errno = 0;
+                               n2 = strtol(optarg, &e, 0);
+                               if (errno || (e == optarg) || *e) {
+                                       fprintf(stderr, "illegal numeric string\n");
+                                       usage();
+                               }
+                               if (n2 < 0) {
+                                       if (-n2 > cur_len) {
+                                               fprintf(stderr, "WARNING: current length smaller then -x %d offset\n",n2);
+                                               cur_len = 0;
+                                       } else
+                                               cur_len += n2;
+                               } else {
+                                       memset(buf + cur_len, 0, n2);
+                                       cur_len += n2;
+                               }
+
                                break;
                        default:
                                usage();