Add NO_C99_FORMAT to support older compilers.

[thirdparty/git.git] / mktag.c

diff --git a/mktag.c b/mktag.c
index 585677eb83cd0fd21963d21291a6af2b54fc9c84..09b6e437d46a71b0123b5cb791cc537cf946e7a1 100644 (file)
--- a/mktag.c
+++ b/mktag.c
@@ -1,10 +1,12 @@
 #include "cache.h"
+#include "tag.h"
 
 /*
- * A signature file has a very simple fixed format: three lines
- * of "object <sha1>" + "type <typename>" + "tag <tagname>",
- * followed by some free-form signature that git itself doesn't
- * care about, but that can be verified with gpg or similar.
+ * A signature file has a very simple fixed format: four lines
+ * of "object <sha1>" + "type <typename>" + "tag <tagname>" +
+ * "tagger <committer>", followed by a blank line, a free-form tag
+ * message and a signature block that git itself doesn't care about,
+ * but that can be verified with gpg or similar.
  *
  * The first three lines are guaranteed to be at least 63 bytes:
  * "object <sha1>\n" is 48 bytes, "type tag\n" at 9 bytes is the
@@ -16,7 +18,7 @@
  * in that size, you're doing something wrong.
  */
 
-// Some random size
+/* Some random size */
 #define MAXSIZE (8192)
 
 /*
@@ -37,6 +39,12 @@ static int verify_object(unsigned char *sha1, const char *expected_type)
        return ret;
 }
 
+#ifdef NO_C99_FORMAT
+#define PD_FMT "%d"
+#else
+#define PD_FMT "%td"
+#endif
+
 static int verify_tag(char *buffer, unsigned long size)
 {
        int typelen;
@@ -44,42 +52,43 @@ static int verify_tag(char *buffer, unsigned long size)
        unsigned char sha1[20];
        const char *object, *type_line, *tag_line, *tagger_line;
 
-       if (size < 64 || size > MAXSIZE-1)
-               return -1;
+       if (size < 64)
+               return error("wanna fool me ? you obviously got the size wrong !");
+
        buffer[size] = 0;
 
        /* Verify object line */
        object = buffer;
        if (memcmp(object, "object ", 7))
-               return -1;
+               return error("char%d: does not start with \"object \"", 0);
+
        if (get_sha1_hex(object + 7, sha1))
-               return -1;
+               return error("char%d: could not get SHA1 hash", 7);
 
        /* Verify type line */
        type_line = object + 48;
        if (memcmp(type_line - 1, "\ntype ", 6))
-               return -1;
+               return error("char%d: could not find \"\\ntype \"", 47);
 
        /* Verify tag-line */
        tag_line = strchr(type_line, '\n');
        if (!tag_line)
-               return -1;
+               return error("char" PD_FMT ": could not find next \"\\n\"", type_line - buffer);
        tag_line++;
        if (memcmp(tag_line, "tag ", 4) || tag_line[4] == '\n')
-               return -1;
+               return error("char" PD_FMT ": no \"tag \" found", tag_line - buffer);
 
        /* Get the actual type */
        typelen = tag_line - type_line - strlen("type \n");
        if (typelen >= sizeof(type))
-               return -1;
+               return error("char" PD_FMT ": type too long", type_line+5 - buffer);
+
        memcpy(type, type_line+5, typelen);
        type[typelen] = 0;
 
        /* Verify that the object matches */
-       if (get_sha1_hex(object + 7, sha1))
-               return -1;
        if (verify_object(sha1, type))
-               return -1;
+               return error("char%d: could not verify object %s", 7, sha1_to_hex(sha1));
 
        /* Verify the tag-name: we don't allow control characters or spaces in it */
        tag_line += 4;
@@ -89,48 +98,50 @@ static int verify_tag(char *buffer, unsigned long size)
                        break;
                if (c > ' ')
                        continue;
-               return -1;
+               return error("char" PD_FMT ": could not verify tag name", tag_line - buffer);
        }
 
        /* Verify the tagger line */
        tagger_line = tag_line;
 
        if (memcmp(tagger_line, "tagger", 6) || (tagger_line[6] == '\n'))
-               return -1;
+               return error("char" PD_FMT ": could not find \"tagger\"", tagger_line - buffer);
+
+       /* TODO: check for committer info + blank line? */
+       /* Also, the minimum length is probably + "tagger .", or 63+8=71 */
 
        /* The actual stuff afterwards we don't care about.. */
        return 0;
 }
 
+#undef PD_FMT
+
 int main(int argc, char **argv)
 {
-       unsigned long size;
-       char buffer[MAXSIZE];
+       unsigned long size = 4096;
+       char *buffer = malloc(size);
        unsigned char result_sha1[20];
 
        if (argc != 1)
                usage("cat <signaturefile> | git-mktag");
 
-       // Read the signature
-       size = 0;
-       for (;;) {
-               int ret = read(0, buffer + size, MAXSIZE - size);
-               if (!ret)
-                       break;
-               if (ret < 0) {
-                       if (errno == EAGAIN)
-                               continue;
-                       break;
-               }
-               size += ret;
+       setup_git_directory();
+
+       if (read_pipe(0, &buffer, &size)) {
+               free(buffer);
+               die("could not read from stdin");
        }
 
-       // Verify it for some basic sanity: it needs to start with "object <sha1>\ntype\ntagger "
+       /* Verify it for some basic sanity: it needs to start with
+          "object <sha1>\ntype\ntagger " */
        if (verify_tag(buffer, size) < 0)
                die("invalid tag signature file");
 
-       if (write_sha1_file(buffer, size, "tag", result_sha1) < 0)
+       if (write_sha1_file(buffer, size, tag_type, result_sha1) < 0)
                die("unable to write tag file");
+
+       free(buffer);
+
        printf("%s\n", sha1_to_hex(result_sha1));
        return 0;
 }