Support noerror option

diff --git a/coreutils/dd.c b/coreutils/dd.c
index 09e6ccc..fb78d53 100644 (file)
--- a/coreutils/dd.c
+++ b/coreutils/dd.c
@@ -46,7 +46,7 @@ static const struct suffix_mult dd_suffixes[] = {
 
 int dd_main(int argc, char **argv)
 {
-       int i, ifd, ofd, oflag, sync_flag = FALSE, trunc = TRUE;
+       int i, ifd, ofd, oflag, sync_flag = FALSE, trunc = TRUE, noerror = FALSE;
        size_t in_full = 0, in_part = 0, out_full = 0, out_part = 0;
        size_t bs = 512, count = -1;
        ssize_t n;
@@ -75,6 +75,9 @@ int dd_main(int argc, char **argv)
                                } else if (strncmp("sync", buf, 4) == 0) {
                                        sync_flag = TRUE;
                                        buf += 4;
+                               } else if (strncmp("noerror", buf, 7) == 0) {
+                                       noerror = TRUE;
+                                       buf += 7;
                                } else {
                                        error_msg_and_die("invalid conversion `%s'", argv[i]+5);
                                }
@@ -131,9 +134,19 @@ int dd_main(int argc, char **argv)
        }
 
        while (in_full + in_part != count) {
+               if (noerror) {
+                       /* Pre-zero the buffer when doing the noerror thing */
+                       memset(buf, '\0', bs);
+               }
                n = safe_read(ifd, buf, bs);
-               if (n < 0)
-                       perror_msg_and_die("%s", infile);
+               if (n < 0) {
+                       if (noerror) {
+                               n = bs;
+                               perror_msg("%s", infile);
+                       } else {
+                               perror_msg_and_die("%s", infile);
+                       }
+               }
                if (n == 0)
                        break;
                if (n == bs)

diff --git a/include/usage.h b/include/usage.h
index ad34dfc..d0f3dfc 100644 (file)
--- a/include/usage.h
+++ b/include/usage.h
@@ -228,7 +228,7 @@
 
 #define dd_trivial_usage \
        "[if=FILE] [of=FILE] [bs=N] [count=N] [skip=N]\n" \
-       "\t  [seek=N] [conv=notrunc|sync]"
+       "\t  [seek=N] [conv=notrunc|noerror|sync]"
 #define dd_full_usage \
        "Copy a file, converting and formatting according to options\n\n" \
        "\tif=FILE\t\tread from FILE instead of stdin\n" \
@@ -238,6 +238,7 @@
        "\tskip=N\t\tskip N input blocks\n" \
        "\tseek=N\t\tskip N output blocks\n" \
        "\tconv=notrunc\tdon't truncate output file\n" \
+       "\tconv=noerror\tcontinue after read errors\n" \
        "\tconv=sync\tpad blocks with zeros\n" \
        "\n" \
        "Numbers may be suffixed by c (x1), w (x2), b (x512), kD (x1000), k (x1024),\n" \