long xdl_atol(char const *str, char const **next) {
long val, base;
char const *top;
for (top = str; XDL_ISDIGIT(*top); top++);
if (next)
*next = top;
for (val = 0, base = 1, top--; top >= str; top--, base *= 10)
val += base * (long)(*top - '0');
return val;
}
static int xdl_load_hunk_info(char const *line, long size, hunkinfo_t *hki) {
char const *next;
if (memcmp(line, "@@ -", 4))
return -1;
line += 4;
size -= 4;
for (; size && !XDL_ISDIGIT(*line); size--, line++);
if (!size || !XDL_ISDIGIT(*line))
return -1;
hki->s1 = xdl_atol(line, &next) - 1;
size -= next - line;
line = next;
for (; size && !XDL_ISDIGIT(*line); size--, line++);
if (!size || !XDL_ISDIGIT(*line))
return -1;
hki->c1 = xdl_atol(line, &next);
size -= next - line;
line = next;
for (; size && !XDL_ISDIGIT(*line); size--, line++);
if (!size || !XDL_ISDIGIT(*line))
return -1;
hki->s2 = xdl_atol(line, &next) - 1;
size -= next - line;
line = next;
for (; size && !XDL_ISDIGIT(*line); size--, line++);
if (!size || !XDL_ISDIGIT(*line))
return -1;
hki->c2 = xdl_atol(line, &next);
size -= next - line;
line = next;
return 0;
}
static int xdl_load_hunk_info(char const *line, long size, hunkinfo_t *hki) {
char const *next;
/*
* The diff header format should be:
*
* @@ -OP,OC +NP,NC @@
*
* Unfortunately some software avoid to emit OP or/and NP in case
* of not existing old or new file (it should be mitted as zero).
* We need to handle both syntaxes.
*/
if (memcmp(line, "@@ -", 4))
return -1;
line += 4;
size -= 4;
if (!size || !XDL_ISDIGIT(*line))
return -1;
hki->s1 = xdl_atol(line, &next);
size -= next - line;
line = next;
if (!size)
return -1;
if (*line == ',') {
size--, line++;
if (!size || !XDL_ISDIGIT(*line))
return -1;
hki->c1 = xdl_atol(line, &next);
size -= next - line;
line = next;
if (!size || *line != ' ')
return -1;
size--, line++;
} else if (*line == ' ') {
size--, line++;
hki->c1 = hki->s1;
hki->s1 = 0;
} else
return -1;
if (!size || *line != '+')
return -1;
size--, line++;
if (!size || !XDL_ISDIGIT(*line))
return -1;
hki->s2 = xdl_atol(line, &next);
size -= next - line;
line = next;
if (!size)
return -1;
if (*line == ',') {
size--, line++;
if (!size || !XDL_ISDIGIT(*line))
return -1;
hki->c2 = xdl_atol(line, &next);
size -= next - line;
line = next;
if (!size || *line != ' ')
return -1;
size--, line++;
} else if (*line == ' ') {
size--, line++;
hki->c2 = hki->s2;
hki->s2 = 0;
} else
return -1;
if (size < 2 || memcmp(line, "@@", 2) != 0)
return -1;
/*
* We start from zero, so decrement by one unless it's the special position
* '0' inside the unified diff (new or deleted file).
*/
if (hki->s1 > 0 && hki->c1 > 0)
hki->s1--;
if (hki->s2 > 0 && hki->c2 > 0)
hki->s2--;
return 0;
}