update_ref(): improve documentation
[gitweb.git] / diff.c
diff --git a/diff.c b/diff.c
index 635dee244d767bffc689550fd3e32d0ac1a37fea..d1bd534caeaf662b0ee0d547d3aa2012310fff57 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -16,6 +16,7 @@
 #include "submodule.h"
 #include "ll-merge.h"
 #include "string-list.h"
+#include "argv-array.h"
 
 #ifdef NO_FAST_WORKING_DIRECTORY
 #define FAST_WORKING_DIRECTORY 0
@@ -51,23 +52,23 @@ static char diff_colors[][COLOR_MAXLEN] = {
        GIT_COLOR_NORMAL,       /* FUNCINFO */
 };
 
-static int parse_diff_color_slot(const char *var, int ofs)
+static int parse_diff_color_slot(const char *var)
 {
-       if (!strcasecmp(var+ofs, "plain"))
+       if (!strcasecmp(var, "plain"))
                return DIFF_PLAIN;
-       if (!strcasecmp(var+ofs, "meta"))
+       if (!strcasecmp(var, "meta"))
                return DIFF_METAINFO;
-       if (!strcasecmp(var+ofs, "frag"))
+       if (!strcasecmp(var, "frag"))
                return DIFF_FRAGINFO;
-       if (!strcasecmp(var+ofs, "old"))
+       if (!strcasecmp(var, "old"))
                return DIFF_FILE_OLD;
-       if (!strcasecmp(var+ofs, "new"))
+       if (!strcasecmp(var, "new"))
                return DIFF_FILE_NEW;
-       if (!strcasecmp(var+ofs, "commit"))
+       if (!strcasecmp(var, "commit"))
                return DIFF_COMMIT;
-       if (!strcasecmp(var+ofs, "whitespace"))
+       if (!strcasecmp(var, "whitespace"))
                return DIFF_WHITESPACE;
-       if (!strcasecmp(var+ofs, "func"))
+       if (!strcasecmp(var, "func"))
                return DIFF_FUNCINFO;
        return -1;
 }
@@ -230,6 +231,8 @@ int git_diff_ui_config(const char *var, const char *value, void *cb)
 
 int git_diff_basic_config(const char *var, const char *value, void *cb)
 {
+       const char *name;
+
        if (!strcmp(var, "diff.renamelimit")) {
                diff_rename_limit_default = git_config_int(var, value);
                return 0;
@@ -238,14 +241,14 @@ int git_diff_basic_config(const char *var, const char *value, void *cb)
        if (userdiff_config(var, value) < 0)
                return -1;
 
-       if (starts_with(var, "diff.color.") || starts_with(var, "color.diff.")) {
-               int slot = parse_diff_color_slot(var, 11);
+       if (skip_prefix(var, "diff.color.", &name) ||
+           skip_prefix(var, "color.diff.", &name)) {
+               int slot = parse_diff_color_slot(name);
                if (slot < 0)
                        return 0;
                if (!value)
                        return config_error_nonbool(var);
-               color_parse(value, var, diff_colors[slot]);
-               return 0;
+               return color_parse(value, diff_colors[slot]);
        }
 
        /* like GNU diff's --suppress-blank-empty option  */
@@ -372,7 +375,7 @@ static unsigned long diff_filespec_size(struct diff_filespec *one)
 {
        if (!DIFF_FILE_VALID(one))
                return 0;
-       diff_populate_filespec(one, 1);
+       diff_populate_filespec(one, CHECK_SIZE_ONLY);
        return one->size;
 }
 
@@ -521,9 +524,9 @@ static void emit_hunk_header(struct emit_callback *ecbdata,
        ep += 2; /* skip over @@ */
 
        /* The hunk header in fraginfo color */
-       strbuf_add(&msgbuf, frag, strlen(frag));
+       strbuf_addstr(&msgbuf, frag);
        strbuf_add(&msgbuf, line, ep - line);
-       strbuf_add(&msgbuf, reset, strlen(reset));
+       strbuf_addstr(&msgbuf, reset);
 
        /*
         * trailing "\r\n"
@@ -537,15 +540,15 @@ static void emit_hunk_header(struct emit_callback *ecbdata,
                if (*ep != ' ' && *ep != '\t')
                        break;
        if (ep != cp) {
-               strbuf_add(&msgbuf, plain, strlen(plain));
+               strbuf_addstr(&msgbuf, plain);
                strbuf_add(&msgbuf, cp, ep - cp);
-               strbuf_add(&msgbuf, reset, strlen(reset));
+               strbuf_addstr(&msgbuf, reset);
        }
 
        if (ep < line + len) {
-               strbuf_add(&msgbuf, func, strlen(func));
+               strbuf_addstr(&msgbuf, func);
                strbuf_add(&msgbuf, ep, line + len - ep);
-               strbuf_add(&msgbuf, reset, strlen(reset));
+               strbuf_addstr(&msgbuf, reset);
        }
 
        strbuf_add(&msgbuf, line + len, org_len - len);
@@ -1360,12 +1363,8 @@ static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
                                          const char *name_b)
 {
        struct diffstat_file *x;
-       x = xcalloc(sizeof (*x), 1);
-       if (diffstat->nr == diffstat->alloc) {
-               diffstat->alloc = alloc_nr(diffstat->alloc);
-               diffstat->files = xrealloc(diffstat->files,
-                               diffstat->alloc * sizeof(x));
-       }
+       x = xcalloc(1, sizeof(*x));
+       ALLOC_GROW(diffstat->files, diffstat->nr + 1, diffstat->alloc);
        diffstat->files[diffstat->nr++] = x;
        if (name_b) {
                x->from_name = xstrdup(name_a);
@@ -1465,20 +1464,12 @@ int print_stat_summary(FILE *fp, int files, int insertions, int deletions)
         * but nothing about added/removed lines? Is this a bug in Git?").
         */
        if (insertions || deletions == 0) {
-               /*
-                * TRANSLATORS: "+" in (+) is a line addition marker;
-                * do not translate it.
-                */
                strbuf_addf(&sb,
                            (insertions == 1) ? ", %d insertion(+)" : ", %d insertions(+)",
                            insertions);
        }
 
        if (deletions || insertions == 0) {
-               /*
-                * TRANSLATORS: "-" in (-) is a line removal marker;
-                * do not translate it.
-                */
                strbuf_addf(&sb,
                            (deletions == 1) ? ", %d deletion(-)" : ", %d deletions(-)",
                            deletions);
@@ -1918,11 +1909,11 @@ static void show_dirstat(struct diff_options *options)
                        diff_free_filespec_data(p->one);
                        diff_free_filespec_data(p->two);
                } else if (DIFF_FILE_VALID(p->one)) {
-                       diff_populate_filespec(p->one, 1);
+                       diff_populate_filespec(p->one, CHECK_SIZE_ONLY);
                        copied = added = 0;
                        diff_free_filespec_data(p->one);
                } else if (DIFF_FILE_VALID(p->two)) {
-                       diff_populate_filespec(p->two, 1);
+                       diff_populate_filespec(p->two, CHECK_SIZE_ONLY);
                        copied = 0;
                        added = p->two->size;
                        diff_free_filespec_data(p->two);
@@ -2196,8 +2187,8 @@ int diff_filespec_is_binary(struct diff_filespec *one)
                        one->is_binary = one->driver->binary;
                else {
                        if (!one->data && DIFF_FILE_VALID(one))
-                               diff_populate_filespec(one, 0);
-                       if (one->data)
+                               diff_populate_filespec(one, CHECK_BINARY);
+                       if (one->is_binary == -1 && one->data)
                                one->is_binary = buffer_is_binary(one->data,
                                                one->size);
                        if (one->is_binary == -1)
@@ -2332,6 +2323,19 @@ static void builtin_diff(const char *name_a,
        } else if (!DIFF_OPT_TST(o, TEXT) &&
            ( (!textconv_one && diff_filespec_is_binary(one)) ||
              (!textconv_two && diff_filespec_is_binary(two)) )) {
+               if (!one->data && !two->data &&
+                   S_ISREG(one->mode) && S_ISREG(two->mode) &&
+                   !DIFF_OPT_TST(o, BINARY)) {
+                       if (!hashcmp(one->sha1, two->sha1)) {
+                               if (must_show_header)
+                                       fprintf(o->file, "%s", header.buf);
+                               goto free_ab_and_return;
+                       }
+                       fprintf(o->file, "%s", header.buf);
+                       fprintf(o->file, "%sBinary files %s and %s differ\n",
+                               line_prefix, lbl[0], lbl[1]);
+                       goto free_ab_and_return;
+               }
                if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
                        die("unable to read files to diff");
                /* Quite common confusing case */
@@ -2352,6 +2356,7 @@ static void builtin_diff(const char *name_a,
        } else {
                /* Crazy xdl interfaces.. */
                const char *diffopts = getenv("GIT_DIFF_OPTS");
+               const char *v;
                xpparam_t xpp;
                xdemitconf_t xecfg;
                struct emit_callback ecbdata;
@@ -2390,10 +2395,10 @@ static void builtin_diff(const char *name_a,
                        xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
                if (!diffopts)
                        ;
-               else if (starts_with(diffopts, "--unified="))
-                       xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
-               else if (starts_with(diffopts, "-u"))
-                       xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
+               else if (skip_prefix(diffopts, "--unified=", &v))
+                       xecfg.ctxlen = strtoul(v, NULL, 10);
+               else if (skip_prefix(diffopts, "-u", &v))
+                       xecfg.ctxlen = strtoul(v, NULL, 10);
                if (o->word_diff)
                        init_diff_words_data(&ecbdata, o, one, two);
                xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
@@ -2675,8 +2680,9 @@ static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
  * grab the data for the blob (or file) for our own in-core comparison.
  * diff_filespec has data and size fields for this purpose.
  */
-int diff_populate_filespec(struct diff_filespec *s, int size_only)
+int diff_populate_filespec(struct diff_filespec *s, unsigned int flags)
 {
+       int size_only = flags & CHECK_SIZE_ONLY;
        int err = 0;
        /*
         * demote FAIL to WARN to allow inspecting the situation
@@ -2731,6 +2737,11 @@ int diff_populate_filespec(struct diff_filespec *s, int size_only)
                }
                if (size_only)
                        return 0;
+               if ((flags & CHECK_BINARY) &&
+                   s->size > big_file_threshold && s->is_binary == -1) {
+                       s->is_binary = 1;
+                       return 0;
+               }
                fd = open(s->path, O_RDONLY);
                if (fd < 0)
                        goto err_empty;
@@ -2752,16 +2763,21 @@ int diff_populate_filespec(struct diff_filespec *s, int size_only)
        }
        else {
                enum object_type type;
-               if (size_only) {
+               if (size_only || (flags & CHECK_BINARY)) {
                        type = sha1_object_info(s->sha1, &s->size);
                        if (type < 0)
                                die("unable to read %s", sha1_to_hex(s->sha1));
-               } else {
-                       s->data = read_sha1_file(s->sha1, &type, &s->size);
-                       if (!s->data)
-                               die("unable to read %s", sha1_to_hex(s->sha1));
-                       s->should_free = 1;
+                       if (size_only)
+                               return 0;
+                       if (s->size > big_file_threshold && s->is_binary == -1) {
+                               s->is_binary = 1;
+                               return 0;
+                       }
                }
+               s->data = read_sha1_file(s->sha1, &type, &s->size);
+               if (!s->data)
+                       die("unable to read %s", sha1_to_hex(s->sha1));
+               s->should_free = 1;
        }
        return 0;
 }
@@ -2891,6 +2907,16 @@ static struct diff_tempfile *prepare_temp_file(const char *name,
        return temp;
 }
 
+static void add_external_diff_name(struct argv_array *argv,
+                                  const char *name,
+                                  struct diff_filespec *df)
+{
+       struct diff_tempfile *temp = prepare_temp_file(name, df);
+       argv_array_push(argv, temp->name);
+       argv_array_push(argv, temp->hex);
+       argv_array_push(argv, temp->mode);
+}
+
 /* An external diff command takes:
  *
  * diff-cmd name infile1 infile1-sha1 infile1-mode \
@@ -2906,50 +2932,33 @@ static void run_external_diff(const char *pgm,
                              int complete_rewrite,
                              struct diff_options *o)
 {
-       const char *spawn_arg[10];
-       int retval;
-       const char **arg = &spawn_arg[0];
+       struct argv_array argv = ARGV_ARRAY_INIT;
+       struct argv_array env = ARGV_ARRAY_INIT;
        struct diff_queue_struct *q = &diff_queued_diff;
-       const char *env[3] = { NULL };
-       char env_counter[50];
-       char env_total[50];
+
+       argv_array_push(&argv, pgm);
+       argv_array_push(&argv, name);
 
        if (one && two) {
-               struct diff_tempfile *temp_one, *temp_two;
-               const char *othername = (other ? other : name);
-               temp_one = prepare_temp_file(name, one);
-               temp_two = prepare_temp_file(othername, two);
-               *arg++ = pgm;
-               *arg++ = name;
-               *arg++ = temp_one->name;
-               *arg++ = temp_one->hex;
-               *arg++ = temp_one->mode;
-               *arg++ = temp_two->name;
-               *arg++ = temp_two->hex;
-               *arg++ = temp_two->mode;
-               if (other) {
-                       *arg++ = other;
-                       *arg++ = xfrm_msg;
+               add_external_diff_name(&argv, name, one);
+               if (!other)
+                       add_external_diff_name(&argv, name, two);
+               else {
+                       add_external_diff_name(&argv, other, two);
+                       argv_array_push(&argv, other);
+                       argv_array_push(&argv, xfrm_msg);
                }
-       } else {
-               *arg++ = pgm;
-               *arg++ = name;
        }
-       *arg = NULL;
-       fflush(NULL);
 
-       env[0] = env_counter;
-       snprintf(env_counter, sizeof(env_counter), "GIT_DIFF_PATH_COUNTER=%d",
-                ++o->diff_path_counter);
-       env[1] = env_total;
-       snprintf(env_total, sizeof(env_total), "GIT_DIFF_PATH_TOTAL=%d", q->nr);
+       argv_array_pushf(&env, "GIT_DIFF_PATH_COUNTER=%d", ++o->diff_path_counter);
+       argv_array_pushf(&env, "GIT_DIFF_PATH_TOTAL=%d", q->nr);
+
+       if (run_command_v_opt_cd_env(argv.argv, RUN_USING_SHELL, NULL, env.argv))
+               die(_("external diff died, stopping at %s"), name);
 
-       retval = run_command_v_opt_cd_env(spawn_arg, RUN_USING_SHELL, NULL, env);
        remove_tempfile();
-       if (retval) {
-               fprintf(stderr, "external diff died, stopping at %s.\n", name);
-               exit(1);
-       }
+       argv_array_clear(&argv);
+       argv_array_clear(&env);
 }
 
 static int similarity_index(struct diff_filepair *p)
@@ -3217,6 +3226,7 @@ void diff_setup(struct diff_options *options)
        options->context = diff_context_default;
        DIFF_OPT_SET(options, RENAME_EMPTY);
 
+       /* pathchange left =NULL by default */
        options->change = diff_change;
        options->add_remove = diff_addremove;
        options->use_color = diff_use_color_default;
@@ -3337,6 +3347,9 @@ void diff_setup_done(struct diff_options *options)
        }
 
        options->diff_path_counter = 0;
+
+       if (DIFF_OPT_TST(options, FOLLOW_RENAMES) && options->pathspec.nr != 1)
+               die(_("--follow requires exactly one pathspec"));
 }
 
 static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
@@ -3366,14 +3379,11 @@ static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *va
        if (c != '-')
                return 0;
        arg++;
-       eq = strchr(arg, '=');
-       if (eq)
-               len = eq - arg;
-       else
-               len = strlen(arg);
+       eq = strchrnul(arg, '=');
+       len = eq - arg;
        if (!len || strncmp(arg, arg_long, len))
                return 0;
-       if (eq) {
+       if (*eq) {
                int n;
                char *end;
                if (!isdigit(*++eq))
@@ -3408,12 +3418,10 @@ int parse_long_opt(const char *opt, const char **argv,
                   const char **optarg)
 {
        const char *arg = argv[0];
-       if (arg[0] != '-' || arg[1] != '-')
+       if (!skip_prefix(arg, "--", &arg))
                return 0;
-       arg += strlen("--");
-       if (!starts_with(arg, opt))
+       if (!skip_prefix(arg, opt, &arg))
                return 0;
-       arg += strlen(opt);
        if (*arg == '=') { /* stuck form: --option=value */
                *optarg = arg + 1;
                return 1;
@@ -3437,13 +3445,13 @@ static int stat_opt(struct diff_options *options, const char **av)
        int count = options->stat_count;
        int argcount = 1;
 
-       arg += strlen("--stat");
+       if (!skip_prefix(arg, "--stat", &arg))
+               die("BUG: stat option does not begin with --stat: %s", arg);
        end = (char *)arg;
 
        switch (*arg) {
        case '-':
-               if (starts_with(arg, "-width")) {
-                       arg += strlen("-width");
+               if (skip_prefix(arg, "-width", &arg)) {
                        if (*arg == '=')
                                width = strtoul(arg + 1, &end, 10);
                        else if (!*arg && !av[1])
@@ -3452,8 +3460,7 @@ static int stat_opt(struct diff_options *options, const char **av)
                                width = strtoul(av[1], &end, 10);
                                argcount = 2;
                        }
-               } else if (starts_with(arg, "-name-width")) {
-                       arg += strlen("-name-width");
+               } else if (skip_prefix(arg, "-name-width", &arg)) {
                        if (*arg == '=')
                                name_width = strtoul(arg + 1, &end, 10);
                        else if (!*arg && !av[1])
@@ -3462,8 +3469,7 @@ static int stat_opt(struct diff_options *options, const char **av)
                                name_width = strtoul(av[1], &end, 10);
                                argcount = 2;
                        }
-               } else if (starts_with(arg, "-graph-width")) {
-                       arg += strlen("-graph-width");
+               } else if (skip_prefix(arg, "-graph-width", &arg)) {
                        if (*arg == '=')
                                graph_width = strtoul(arg + 1, &end, 10);
                        else if (!*arg && !av[1])
@@ -3472,8 +3478,7 @@ static int stat_opt(struct diff_options *options, const char **av)
                                graph_width = strtoul(av[1], &end, 10);
                                argcount = 2;
                        }
-               } else if (starts_with(arg, "-count")) {
-                       arg += strlen("-count");
+               } else if (skip_prefix(arg, "-count", &arg)) {
                        if (*arg == '=')
                                count = strtoul(arg + 1, &end, 10);
                        else if (!*arg && !av[1])
@@ -3600,14 +3605,6 @@ static int parse_diff_filter_opt(const char *optarg, struct diff_options *opt)
        return 0;
 }
 
-/* Used only by "diff-files" and "diff --no-index" */
-void handle_deprecated_show_diff_q(struct diff_options *opt)
-{
-       warning("'diff -q' and 'diff-files -q' are deprecated.");
-       warning("Use 'diff --diff-filter=d' instead to ignore deleted filepairs.");
-       parse_diff_filter_opt("d", opt);
-}
-
 static void enable_patch_output(int *fmt) {
        *fmt &= ~DIFF_FORMAT_NO_OUTPUT;
        *fmt |= DIFF_FORMAT_PATCH;
@@ -3634,17 +3631,17 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
                options->output_format |= DIFF_FORMAT_SHORTSTAT;
        else if (!strcmp(arg, "-X") || !strcmp(arg, "--dirstat"))
                return parse_dirstat_opt(options, "");
-       else if (starts_with(arg, "-X"))
-               return parse_dirstat_opt(options, arg + 2);
-       else if (starts_with(arg, "--dirstat="))
-               return parse_dirstat_opt(options, arg + 10);
+       else if (skip_prefix(arg, "-X", &arg))
+               return parse_dirstat_opt(options, arg);
+       else if (skip_prefix(arg, "--dirstat=", &arg))
+               return parse_dirstat_opt(options, arg);
        else if (!strcmp(arg, "--cumulative"))
                return parse_dirstat_opt(options, "cumulative");
        else if (!strcmp(arg, "--dirstat-by-file"))
                return parse_dirstat_opt(options, "files");
-       else if (starts_with(arg, "--dirstat-by-file=")) {
+       else if (skip_prefix(arg, "--dirstat-by-file=", &arg)) {
                parse_dirstat_opt(options, "files");
-               return parse_dirstat_opt(options, arg + 18);
+               return parse_dirstat_opt(options, arg);
        }
        else if (!strcmp(arg, "--check"))
                options->output_format |= DIFF_FORMAT_CHECKDIFF;
@@ -3694,9 +3691,9 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
                DIFF_OPT_CLR(options, RENAME_EMPTY);
        else if (!strcmp(arg, "--relative"))
                DIFF_OPT_SET(options, RELATIVE_NAME);
-       else if (starts_with(arg, "--relative=")) {
+       else if (skip_prefix(arg, "--relative=", &arg)) {
                DIFF_OPT_SET(options, RELATIVE_NAME);
-               options->prefix = arg + 11;
+               options->prefix = arg;
        }
 
        /* xdiff options */
@@ -3747,8 +3744,8 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
                DIFF_OPT_CLR(options, FOLLOW_RENAMES);
        else if (!strcmp(arg, "--color"))
                options->use_color = 1;
-       else if (starts_with(arg, "--color=")) {
-               int value = git_config_colorbool(NULL, arg+8);
+       else if (skip_prefix(arg, "--color=", &arg)) {
+               int value = git_config_colorbool(NULL, arg);
                if (value < 0)
                        return error("option `color' expects \"always\", \"auto\", or \"never\"");
                options->use_color = value;
@@ -3759,29 +3756,28 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
                options->use_color = 1;
                options->word_diff = DIFF_WORDS_COLOR;
        }
-       else if (starts_with(arg, "--color-words=")) {
+       else if (skip_prefix(arg, "--color-words=", &arg)) {
                options->use_color = 1;
                options->word_diff = DIFF_WORDS_COLOR;
-               options->word_regex = arg + 14;
+               options->word_regex = arg;
        }
        else if (!strcmp(arg, "--word-diff")) {
                if (options->word_diff == DIFF_WORDS_NONE)
                        options->word_diff = DIFF_WORDS_PLAIN;
        }
-       else if (starts_with(arg, "--word-diff=")) {
-               const char *type = arg + 12;
-               if (!strcmp(type, "plain"))
+       else if (skip_prefix(arg, "--word-diff=", &arg)) {
+               if (!strcmp(arg, "plain"))
                        options->word_diff = DIFF_WORDS_PLAIN;
-               else if (!strcmp(type, "color")) {
+               else if (!strcmp(arg, "color")) {
                        options->use_color = 1;
                        options->word_diff = DIFF_WORDS_COLOR;
                }
-               else if (!strcmp(type, "porcelain"))
+               else if (!strcmp(arg, "porcelain"))
                        options->word_diff = DIFF_WORDS_PORCELAIN;
-               else if (!strcmp(type, "none"))
+               else if (!strcmp(arg, "none"))
                        options->word_diff = DIFF_WORDS_NONE;
                else
-                       die("bad --word-diff argument: %s", type);
+                       die("bad --word-diff argument: %s", arg);
        }
        else if ((argcount = parse_long_opt("word-diff-regex", av, &optarg))) {
                if (options->word_diff == DIFF_WORDS_NONE)
@@ -3804,13 +3800,13 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
        else if (!strcmp(arg, "--ignore-submodules")) {
                DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
                handle_ignore_submodules_arg(options, "all");
-       } else if (starts_with(arg, "--ignore-submodules=")) {
+       } else if (skip_prefix(arg, "--ignore-submodules=", &arg)) {
                DIFF_OPT_SET(options, OVERRIDE_SUBMODULE_CONFIG);
-               handle_ignore_submodules_arg(options, arg + 20);
+               handle_ignore_submodules_arg(options, arg);
        } else if (!strcmp(arg, "--submodule"))
                DIFF_OPT_SET(options, SUBMODULE_LOG);
-       else if (starts_with(arg, "--submodule="))
-               return parse_submodule_opt(options, arg + 12);
+       else if (skip_prefix(arg, "--submodule=", &arg))
+               return parse_submodule_opt(options, arg);
 
        /* misc options */
        else if (!strcmp(arg, "-z"))
@@ -3845,8 +3841,8 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
        }
        else if (!strcmp(arg, "--abbrev"))
                options->abbrev = DEFAULT_ABBREV;
-       else if (starts_with(arg, "--abbrev=")) {
-               options->abbrev = strtoul(arg + 9, NULL, 10);
+       else if (skip_prefix(arg, "--abbrev=", &arg)) {
+               options->abbrev = strtoul(arg, NULL, 10);
                if (options->abbrev < MINIMUM_ABBREV)
                        options->abbrev = MINIMUM_ABBREV;
                else if (40 < options->abbrev)
@@ -3927,16 +3923,13 @@ static int diff_scoreopt_parse(const char *opt)
        cmd = *opt++;
        if (cmd == '-') {
                /* convert the long-form arguments into short-form versions */
-               if (starts_with(opt, "break-rewrites")) {
-                       opt += strlen("break-rewrites");
+               if (skip_prefix(opt, "break-rewrites", &opt)) {
                        if (*opt == 0 || *opt++ == '=')
                                cmd = 'B';
-               } else if (starts_with(opt, "find-copies")) {
-                       opt += strlen("find-copies");
+               } else if (skip_prefix(opt, "find-copies", &opt)) {
                        if (*opt == 0 || *opt++ == '=')
                                cmd = 'C';
-               } else if (starts_with(opt, "find-renames")) {
-                       opt += strlen("find-renames");
+               } else if (skip_prefix(opt, "find-renames", &opt)) {
                        if (*opt == 0 || *opt++ == '=')
                                cmd = 'M';
                }
@@ -3966,11 +3959,7 @@ struct diff_queue_struct diff_queued_diff;
 
 void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
 {
-       if (queue->alloc <= queue->nr) {
-               queue->alloc = alloc_nr(queue->alloc);
-               queue->queue = xrealloc(queue->queue,
-                                       sizeof(dp) * queue->alloc);
-       }
+       ALLOC_GROW(queue->queue, queue->nr + 1, queue->alloc);
        queue->queue[queue->nr++] = dp;
 }
 
@@ -4722,8 +4711,8 @@ static int diff_filespec_check_stat_unmatch(struct diff_filepair *p)
            !DIFF_FILE_VALID(p->two) ||
            (p->one->sha1_valid && p->two->sha1_valid) ||
            (p->one->mode != p->two->mode) ||
-           diff_populate_filespec(p->one, 1) ||
-           diff_populate_filespec(p->two, 1) ||
+           diff_populate_filespec(p->one, CHECK_SIZE_ONLY) ||
+           diff_populate_filespec(p->two, CHECK_SIZE_ONLY) ||
            (p->one->size != p->two->size) ||
            !diff_filespec_is_identical(p->one, p->two)) /* (2) */
                p->skip_stat_unmatch_result = 1;
@@ -4776,6 +4765,7 @@ void diffcore_fix_diff_index(struct diff_options *options)
 
 void diffcore_std(struct diff_options *options)
 {
+       /* NOTE please keep the following in sync with diff_tree_combined() */
        if (options->skip_stat_unmatch)
                diffcore_skip_stat_unmatch(options);
        if (!options->found_follow) {
@@ -4964,7 +4954,7 @@ static char *run_textconv(const char *pgm, struct diff_filespec *spec,
        struct diff_tempfile *temp;
        const char *argv[3];
        const char **arg = argv;
-       struct child_process child;
+       struct child_process child = CHILD_PROCESS_INIT;
        struct strbuf buf = STRBUF_INIT;
        int err = 0;
 
@@ -4973,7 +4963,6 @@ static char *run_textconv(const char *pgm, struct diff_filespec *spec,
        *arg++ = temp->name;
        *arg = NULL;
 
-       memset(&child, 0, sizeof(child));
        child.use_shell = 1;
        child.argv = argv;
        child.out = -1;