t9300: avoid short reads from dd

[thirdparty/git.git] / diff.c

diff --git a/diff.c b/diff.c
index 71efa8edd49fe1c80fb37a0468c68ef5ab0d2596..c248bc64c57b3206905dd8e6f72a702073a137cc 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -1771,8 +1771,14 @@ static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *pre
 
 static void diff_filespec_load_driver(struct diff_filespec *one)
 {
-       if (!one->driver)
+       /* Use already-loaded driver */
+       if (one->driver)
+               return;
+
+       if (S_ISREG(one->mode))
                one->driver = userdiff_find_by_path(one->path);
+
+       /* Fallback to default settings */
        if (!one->driver)
                one->driver = userdiff_find_by_name("default");
 }
@@ -1820,8 +1826,7 @@ struct userdiff_driver *get_textconv(struct diff_filespec *one)
 {
        if (!DIFF_FILE_VALID(one))
                return NULL;
-       if (!S_ISREG(one->mode))
-               return NULL;
+
        diff_filespec_load_driver(one);
        if (!one->driver->textconv)
                return NULL;
@@ -3140,16 +3145,19 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
                return stat_opt(options, av);
 
        /* renames options */
-       else if (!prefixcmp(arg, "-B")) {
+       else if (!prefixcmp(arg, "-B") || !prefixcmp(arg, "--break-rewrites=") ||
+                !strcmp(arg, "--break-rewrites")) {
                if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
                        return -1;
        }
-       else if (!prefixcmp(arg, "-M")) {
+       else if (!prefixcmp(arg, "-M") || !prefixcmp(arg, "--detect-renames=") ||
+                !strcmp(arg, "--detect-renames")) {
                if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
                        return -1;
                options->detect_rename = DIFF_DETECT_RENAME;
        }
-       else if (!prefixcmp(arg, "-C")) {
+       else if (!prefixcmp(arg, "-C") || !prefixcmp(arg, "--detect-copies=") ||
+                !strcmp(arg, "--detect-copies")) {
                if (options->detect_rename == DIFF_DETECT_COPY)
                        DIFF_OPT_SET(options, FIND_COPIES_HARDER);
                if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
@@ -3323,7 +3331,7 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
        return 1;
 }
 
-static int parse_num(const char **cp_p)
+int parse_rename_score(const char **cp_p)
 {
        unsigned long num, scale;
        int ch, dot;
@@ -3366,10 +3374,26 @@ static int diff_scoreopt_parse(const char *opt)
        if (*opt++ != '-')
                return -1;
        cmd = *opt++;
+       if (cmd == '-') {
+               /* convert the long-form arguments into short-form versions */
+               if (!prefixcmp(opt, "break-rewrites")) {
+                       opt += strlen("break-rewrites");
+                       if (*opt == 0 || *opt++ == '=')
+                               cmd = 'B';
+               } else if (!prefixcmp(opt, "detect-copies")) {
+                       opt += strlen("detect-copies");
+                       if (*opt == 0 || *opt++ == '=')
+                               cmd = 'C';
+               } else if (!prefixcmp(opt, "detect-renames")) {
+                       opt += strlen("detect-renames");
+                       if (*opt == 0 || *opt++ == '=')
+                               cmd = 'M';
+               }
+       }
        if (cmd != 'M' && cmd != 'C' && cmd != 'B')
                return -1; /* that is not a -M, -C nor -B option */
 
-       opt1 = parse_num(&opt);
+       opt1 = parse_rename_score(&opt);
        if (cmd != 'B')
                opt2 = 0;
        else {
@@ -3379,7 +3403,7 @@ static int diff_scoreopt_parse(const char *opt)
                        return -1; /* we expect -B80/99 or -B80 */
                else {
                        opt++;
-                       opt2 = parse_num(&opt);
+                       opt2 = parse_rename_score(&opt);
                }
        }
        if (*opt != 0)
@@ -3532,7 +3556,7 @@ static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
 
        if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
            (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
-               return; /* no tree diffs in patch format */
+               return; /* no useful stat for tree diffs */
 
        run_diffstat(p, o, diffstat);
 }
@@ -3545,7 +3569,7 @@ static void diff_flush_checkdiff(struct diff_filepair *p,
 
        if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
            (DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
-               return; /* no tree diffs in patch format */
+               return; /* nothing to check in tree diffs */
 
        run_checkdiff(p, o);
 }
@@ -3870,7 +3894,7 @@ static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
 
                xpp.flags = 0;
                xecfg.ctxlen = 3;
-               xecfg.flags = XDL_EMIT_FUNCNAMES;
+               xecfg.flags = 0;
                xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
                              &xpp, &xecfg);
        }