RelNotes: the first batch of topics graduated to 'master'

[git.git] / xdiff / xutils.c

diff --git a/xdiff/xutils.c b/xdiff/xutils.c
index bc12f298953a4e72b323f73607278028ec4a2805..0de084e53f5144153373cc66cae7b523b4ae2812 100644 (file)
--- 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;
@@ -190,8 +174,10 @@ 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 s1 == s2 && !memcmp(l1, l2, s1);
+               return 0;
 
        i1 = 0;
        i2 = 0;
@@ -209,18 +195,18 @@ int xdl_recmatch(const char *l1, long s1, const char *l2, long s2, long flags)
                        if (l1[i1++] != l2[i2++])
                                return 0;
                skip_ws:
-                       while (i1 < s1 && isspace(l1[i1]))
+                       while (i1 < s1 && XDL_ISSPACE(l1[i1]))
                                i1++;
-                       while (i2 < s2 && isspace(l2[i2]))
+                       while (i2 < s2 && XDL_ISSPACE(l2[i2]))
                                i2++;
                }
        } else if (flags & XDF_IGNORE_WHITESPACE_CHANGE) {
                while (i1 < s1 && i2 < s2) {
-                       if (isspace(l1[i1]) && isspace(l2[i2])) {
+                       if (XDL_ISSPACE(l1[i1]) && XDL_ISSPACE(l2[i2])) {
                                /* Skip matching spaces and try again */
-                               while (i1 < s1 && isspace(l1[i1]))
+                               while (i1 < s1 && XDL_ISSPACE(l1[i1]))
                                        i1++;
-                               while (i2 < s2 && isspace(l2[i2]))
+                               while (i2 < s2 && XDL_ISSPACE(l2[i2]))
                                        i2++;
                                continue;
                        }
@@ -239,13 +225,13 @@ int xdl_recmatch(const char *l1, long s1, const char *l2, long s2, long flags)
         * while there still are characters remaining on both lines.
         */
        if (i1 < s1) {
-               while (i1 < s1 && isspace(l1[i1]))
+               while (i1 < s1 && XDL_ISSPACE(l1[i1]))
                        i1++;
                if (s1 != i1)
                        return 0;
        }
        if (i2 < s2) {
-               while (i2 < s2 && isspace(l2[i2]))
+               while (i2 < s2 && XDL_ISSPACE(l2[i2]))
                        i2++;
                return (s2 == i2);
        }
@@ -258,10 +244,10 @@ 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;
                        int at_eol;
-                       while (ptr + 1 < top && isspace(ptr[1])
+                       while (ptr + 1 < top && XDL_ISSPACE(ptr[1])
                                        && ptr[1] != '\n')
                                ptr++;
                        at_eol = (top <= ptr + 1 || ptr[1] == '\n');
@@ -400,3 +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;
+}