summaryrefslogtreecommitdiff
path: root/xdiff/xutils.c
diff options
context:
space:
mode:
Diffstat (limited to 'xdiff/xutils.c')
-rw-r--r--xdiff/xutils.c149
1 files changed, 94 insertions, 55 deletions
diff --git a/xdiff/xutils.c b/xdiff/xutils.c
index d7974d1a3e..0de084e53f 100644
--- a/xdiff/xutils.c
+++ b/xdiff/xutils.c
@@ -24,10 +24,6 @@
-#define XDL_GUESS_NLINES 256
-
-
-
long xdl_bogosqrt(long n) {
long i;
@@ -71,12 +67,6 @@ void *xdl_mmfile_first(mmfile_t *mmf, long *size)
}
-void *xdl_mmfile_next(mmfile_t *mmf, long *size)
-{
- return NULL;
-}
-
-
long xdl_mmfile_size(mmfile_t *mmf)
{
return mmf->size;
@@ -159,18 +149,12 @@ void *xdl_cha_next(chastore_t *cha) {
}
-long xdl_guess_lines(mmfile_t *mf) {
+long xdl_guess_lines(mmfile_t *mf, long sample) {
long nl = 0, size, tsize = 0;
char const *data, *cur, *top;
if ((cur = data = xdl_mmfile_first(mf, &size)) != NULL) {
- for (top = data + size; nl < XDL_GUESS_NLINES;) {
- if (cur >= top) {
- tsize += (long) (cur - data);
- if (!(cur = data = xdl_mmfile_next(mf, &size)))
- break;
- top = data + size;
- }
+ for (top = data + size; nl < sample && cur < top; ) {
nl++;
if (!(cur = memchr(cur, '\n', top - cur)))
cur = top;
@@ -190,48 +174,68 @@ int xdl_recmatch(const char *l1, long s1, const char *l2, long s2, long flags)
{
int i1, i2;
+ if (s1 == s2 && !memcmp(l1, l2, s1))
+ return 1;
+ if (!(flags & XDF_WHITESPACE_FLAGS))
+ return 0;
+
+ i1 = 0;
+ i2 = 0;
+
+ /*
+ * -w matches everything that matches with -b, and -b in turn
+ * matches everything that matches with --ignore-space-at-eol.
+ *
+ * Each flavor of ignoring needs different logic to skip whitespaces
+ * while we have both sides to compare.
+ */
if (flags & XDF_IGNORE_WHITESPACE) {
- for (i1 = i2 = 0; i1 < s1 && i2 < s2; ) {
- if (isspace(l1[i1]))
- while (isspace(l1[i1]) && i1 < s1)
- i1++;
- if (isspace(l2[i2]))
- while (isspace(l2[i2]) && i2 < s2)
- i2++;
- if (i1 < s1 && i2 < s2 && l1[i1++] != l2[i2++])
+ goto skip_ws;
+ while (i1 < s1 && i2 < s2) {
+ if (l1[i1++] != l2[i2++])
return 0;
+ skip_ws:
+ while (i1 < s1 && XDL_ISSPACE(l1[i1]))
+ i1++;
+ while (i2 < s2 && XDL_ISSPACE(l2[i2]))
+ i2++;
}
- return (i1 >= s1 && i2 >= s2);
} else if (flags & XDF_IGNORE_WHITESPACE_CHANGE) {
- for (i1 = i2 = 0; i1 < s1 && i2 < s2; ) {
- if (isspace(l1[i1])) {
- if (!isspace(l2[i2]))
- return 0;
- while (isspace(l1[i1]) && i1 < s1)
+ while (i1 < s1 && i2 < s2) {
+ if (XDL_ISSPACE(l1[i1]) && XDL_ISSPACE(l2[i2])) {
+ /* Skip matching spaces and try again */
+ while (i1 < s1 && XDL_ISSPACE(l1[i1]))
i1++;
- while (isspace(l2[i2]) && i2 < s2)
+ while (i2 < s2 && XDL_ISSPACE(l2[i2]))
i2++;
- } else if (l1[i1++] != l2[i2++])
+ continue;
+ }
+ if (l1[i1++] != l2[i2++])
return 0;
}
- return (i1 >= s1 && i2 >= s2);
} else if (flags & XDF_IGNORE_WHITESPACE_AT_EOL) {
- for (i1 = i2 = 0; i1 < s1 && i2 < s2; ) {
- if (l1[i1] != l2[i2]) {
- while (i1 < s1 && isspace(l1[i1]))
- i1++;
- while (i2 < s2 && isspace(l2[i2]))
- i2++;
- if (i1 < s1 || i2 < s2)
- return 0;
- return 1;
- }
+ while (i1 < s1 && i2 < s2 && l1[i1++] == l2[i2++])
+ ; /* keep going */
+ }
+
+ /*
+ * After running out of one side, the remaining side must have
+ * nothing but whitespace for the lines to match. Note that
+ * ignore-whitespace-at-eol case may break out of the loop
+ * while there still are characters remaining on both lines.
+ */
+ if (i1 < s1) {
+ while (i1 < s1 && XDL_ISSPACE(l1[i1]))
i1++;
+ if (s1 != i1)
+ return 0;
+ }
+ if (i2 < s2) {
+ while (i2 < s2 && XDL_ISSPACE(l2[i2]))
i2++;
- }
- return i1 >= s1 && i2 >= s2;
- } else
- return s1 == s2 && !memcmp(l1, l2, s1);
+ return (s2 == i2);
+ }
+ return 1;
}
static unsigned long xdl_hash_record_with_whitespace(char const **data,
@@ -240,18 +244,22 @@ static unsigned long xdl_hash_record_with_whitespace(char const **data,
char const *ptr = *data;
for (; ptr < top && *ptr != '\n'; ptr++) {
- if (isspace(*ptr)) {
+ if (XDL_ISSPACE(*ptr)) {
const char *ptr2 = ptr;
- while (ptr + 1 < top && isspace(ptr[1])
+ int at_eol;
+ while (ptr + 1 < top && XDL_ISSPACE(ptr[1])
&& ptr[1] != '\n')
ptr++;
- if (flags & XDF_IGNORE_WHITESPACE_CHANGE
- && ptr[1] != '\n') {
+ at_eol = (top <= ptr + 1 || ptr[1] == '\n');
+ if (flags & XDF_IGNORE_WHITESPACE)
+ ; /* already handled */
+ else if (flags & XDF_IGNORE_WHITESPACE_CHANGE
+ && !at_eol) {
ha += (ha << 5);
ha ^= (unsigned long) ' ';
}
- if (flags & XDF_IGNORE_WHITESPACE_AT_EOL
- && ptr[1] != '\n') {
+ else if (flags & XDF_IGNORE_WHITESPACE_AT_EOL
+ && !at_eol) {
while (ptr2 != ptr + 1) {
ha += (ha << 5);
ha ^= (unsigned long) *ptr2;
@@ -378,3 +386,34 @@ int xdl_emit_hunk_hdr(long s1, long c1, long s2, long c2,
return 0;
}
+
+int xdl_fall_back_diff(xdfenv_t *diff_env, xpparam_t const *xpp,
+ int line1, int count1, int line2, int count2)
+{
+ /*
+ * This probably does not work outside Git, since
+ * we have a very simple mmfile structure.
+ *
+ * Note: ideally, we would reuse the prepared environment, but
+ * the libxdiff interface does not (yet) allow for diffing only
+ * ranges of lines instead of the whole files.
+ */
+ mmfile_t subfile1, subfile2;
+ xdfenv_t env;
+
+ subfile1.ptr = (char *)diff_env->xdf1.recs[line1 - 1]->ptr;
+ subfile1.size = diff_env->xdf1.recs[line1 + count1 - 2]->ptr +
+ diff_env->xdf1.recs[line1 + count1 - 2]->size - subfile1.ptr;
+ subfile2.ptr = (char *)diff_env->xdf2.recs[line2 - 1]->ptr;
+ subfile2.size = diff_env->xdf2.recs[line2 + count2 - 2]->ptr +
+ diff_env->xdf2.recs[line2 + count2 - 2]->size - subfile2.ptr;
+ if (xdl_do_diff(&subfile1, &subfile2, xpp, &env) < 0)
+ return -1;
+
+ memcpy(diff_env->xdf1.rchg + line1 - 1, env.xdf1.rchg, count1);
+ memcpy(diff_env->xdf2.rchg + line2 - 1, env.xdf2.rchg, count2);
+
+ xdl_free_env(&env);
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-17 18:38:21 +0000