dateformat: parse %(xxdate) %(yydate:format) correctly

diff --git a/convert.c b/convert.c
index 9ee31b0ee0949e1d45ac70b463efbb0d47132b32..d77c8eb8b2802d675b320ddeb063c1cf70cc57d8 100644 (file)
--- a/convert.c
+++ b/convert.c
@@ -86,7 +86,7 @@ static char *crlf_to_git(const char *path, const char *src, unsigned long *sizep
        unsigned long size, nsize;
        struct text_stat stats;
 
-       if ((action == CRLF_BINARY) || (action == CRLF_GUESS && !auto_crlf))
+       if ((action == CRLF_BINARY) || !auto_crlf)
                return NULL;
 
        size = *sizep;
@@ -154,7 +154,7 @@ static char *crlf_to_worktree(const char *path, const char *src, unsigned long *
        unsigned char last;
 
        if ((action == CRLF_BINARY) || (action == CRLF_INPUT) ||
-           (action == CRLF_GUESS && auto_crlf <= 0))
+           auto_crlf <= 0)
                return NULL;
 
        size = *sizep;
@@ -412,7 +412,7 @@ static void setup_convert_check(struct git_attr_check *check)
 static int count_ident(const char *cp, unsigned long size)
 {
        /*
-        * "$ident: 0000000000000000000000000000000000000000 $" <=> "$ident$"
+        * "$Id: 0000000000000000000000000000000000000000 $" <=> "$Id$"
         */
        int cnt = 0;
        char ch;
@@ -422,20 +422,20 @@ static int count_ident(const char *cp, unsigned long size)
                size--;
                if (ch != '$')
                        continue;
-               if (size < 6)
+               if (size < 3)
                        break;
-               if (memcmp("ident", cp, 5))
+               if (memcmp("Id", cp, 2))
                        continue;
-               ch = cp[5];
-               cp += 6;
-               size -= 6;
+               ch = cp[2];
+               cp += 3;
+               size -= 3;
                if (ch == '$')
-                       cnt++; /* $ident$ */
+                       cnt++; /* $Id$ */
                if (ch != ':')
                        continue;
 
                /*
-                * "$ident: ... "; scan up to the closing dollar sign and discard.
+                * "$Id: ... "; scan up to the closing dollar sign and discard.
                 */
                while (size) {
                        ch = *cp++;
@@ -466,10 +466,10 @@ static char *ident_to_git(const char *path, const char *src, unsigned long *size
        for (dst = buf; size; size--) {
                char ch = *src++;
                *dst++ = ch;
-               if ((ch == '$') && (6 <= size) &&
-                   !memcmp("ident:", src, 6)) {
-                       unsigned long rem = size - 6;
-                       const char *cp = src + 6;
+               if ((ch == '$') && (3 <= size) &&
+                   !memcmp("Id:", src, 3)) {
+                       unsigned long rem = size - 3;
+                       const char *cp = src + 3;
                        do {
                                ch = *cp++;
                                if (ch == '$')
@@ -478,8 +478,8 @@ static char *ident_to_git(const char *path, const char *src, unsigned long *size
                        } while (rem);
                        if (!rem)
                                continue;
-                       memcpy(dst, "ident$", 6);
-                       dst += 6;
+                       memcpy(dst, "Id$", 3);
+                       dst += 3;
                        size -= (cp - src);
                        src = cp;
                }
@@ -509,36 +509,71 @@ static char *ident_to_worktree(const char *path, const char *src, unsigned long
 
        for (dst = buf; size; size--) {
                const char *cp;
+               /* Fetch next source character, move the pointer on */
                char ch = *src++;
+               /* Copy the current character to the destination */
                *dst++ = ch;
-               if ((ch != '$') || (size < 6) || memcmp("ident", src, 5))
+               /* If the current character is "$" or there are less than three
+                * remaining bytes or the two bytes following this one are not
+                * "Id", then simply read the next character */
+               if ((ch != '$') || (size < 3) || memcmp("Id", src, 2))
                        continue;
+               /*
+                * Here when
+                *  - There are more than 2 bytes remaining
+                *  - The current three bytes are "$Id"
+                * with
+                *  - ch == "$"
+                *  - src[0] == "I"
+                */
+
+               /*
+                * It's possible that an expanded Id has crept its way into the
+                * repository, we cope with that by stripping the expansion out
+                */
+               if (src[2] == ':') {
+                       /* Expanded keywords have "$Id:" at the front */
 
-               if (src[5] == ':') {
                        /* discard up to but not including the closing $ */
-                       unsigned long rem = size - 6;
-                       cp = src + 6;
+                       unsigned long rem = size - 3;
+                       /* Point at first byte after the ":" */
+                       cp = src + 3;
+                       /*
+                        * Throw away characters until either
+                        *  - we reach a "$"
+                        *  - we run out of bytes (rem == 0)
+                        */
                        do {
-                               ch = *cp++;
+                               ch = *cp;
                                if (ch == '$')
                                        break;
+                               cp++;
                                rem--;
                        } while (rem);
+                       /* If the above finished because it ran out of characters, then
+                        * this is an incomplete keyword, so don't run the expansion */
                        if (!rem)
                                continue;
-                       size -= (cp - src);
-               } else if (src[5] == '$')
-                       cp = src + 5;
+               } else if (src[2] == '$')
+                       cp = src + 2;
                else
+                       /* Anything other than "$Id:XXX$" or $Id$ and we skip the
+                        * expansion */
                        continue;
 
-               memcpy(dst, "ident: ", 7);
-               dst += 7;
+               /* cp is now pointing at the last $ of the keyword */
+
+               memcpy(dst, "Id: ", 4);
+               dst += 4;
                memcpy(dst, sha1_to_hex(sha1), 40);
                dst += 40;
                *dst++ = ' ';
+
+               /* Adjust for the characters we've discarded */
                size -= (cp - src);
                src = cp;
+
+               /* Copy the final "$" */
                *dst++ = *src++;
                size--;
        }