mirror of
https://github.com/git/git.git
synced 2024-11-18 20:43:52 +01:00
cc44c7655f
This mechanically converts strncmp() to use prefixcmp(), but only when
the parameters match specific patterns, so that they can be verified
easily. Leftover from this will be fixed in a separate step, including
idiotic conversions like
if (!strncmp("foo", arg, 3))
=>
if (!(-prefixcmp(arg, "foo")))
This was done by using this script in px.perl
#!/usr/bin/perl -i.bak -p
if (/strncmp\(([^,]+), "([^\\"]*)", (\d+)\)/ && (length($2) == $3)) {
s|strncmp\(([^,]+), "([^\\"]*)", (\d+)\)|prefixcmp($1, "$2")|;
}
if (/strncmp\("([^\\"]*)", ([^,]+), (\d+)\)/ && (length($1) == $3)) {
s|strncmp\("([^\\"]*)", ([^,]+), (\d+)\)|(-prefixcmp($2, "$1"))|;
}
and running:
$ git grep -l strncmp -- '*.c' | xargs perl px.perl
Signed-off-by: Junio C Hamano <junkio@cox.net>
285 lines
6.6 KiB
C
285 lines
6.6 KiB
C
#include "cache.h"
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#include "commit.h"
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#include "tag.h"
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#include "refs.h"
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#include "builtin.h"
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#define SEEN (1u<<0)
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#define MAX_TAGS (FLAG_BITS - 1)
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static const char describe_usage[] =
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"git-describe [--all] [--tags] [--abbrev=<n>] <committish>*";
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static int debug; /* Display lots of verbose info */
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static int all; /* Default to annotated tags only */
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static int tags; /* But allow any tags if --tags is specified */
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static int abbrev = DEFAULT_ABBREV;
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static int max_candidates = 10;
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struct commit_name {
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int prio; /* annotated tag = 2, tag = 1, head = 0 */
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char path[FLEX_ARRAY]; /* more */
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};
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static const char *prio_names[] = {
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"head", "lightweight", "annotated",
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};
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static void add_to_known_names(const char *path,
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struct commit *commit,
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int prio)
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{
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struct commit_name *e = commit->util;
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if (!e || e->prio < prio) {
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size_t len = strlen(path)+1;
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free(e);
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e = xmalloc(sizeof(struct commit_name) + len);
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e->prio = prio;
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memcpy(e->path, path, len);
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commit->util = e;
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}
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}
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static int get_name(const char *path, const unsigned char *sha1, int flag, void *cb_data)
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{
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struct commit *commit = lookup_commit_reference_gently(sha1, 1);
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struct object *object;
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int prio;
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if (!commit)
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return 0;
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object = parse_object(sha1);
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/* If --all, then any refs are used.
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* If --tags, then any tags are used.
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* Otherwise only annotated tags are used.
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*/
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if (!prefixcmp(path, "refs/tags/")) {
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if (object->type == OBJ_TAG)
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prio = 2;
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else
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prio = 1;
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}
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else
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prio = 0;
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if (!all) {
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if (!prio)
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return 0;
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if (!tags && prio < 2)
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return 0;
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}
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add_to_known_names(all ? path + 5 : path + 10, commit, prio);
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return 0;
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}
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struct possible_tag {
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struct commit_name *name;
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int depth;
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int found_order;
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unsigned flag_within;
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};
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static int compare_pt(const void *a_, const void *b_)
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{
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struct possible_tag *a = (struct possible_tag *)a_;
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struct possible_tag *b = (struct possible_tag *)b_;
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if (a->name->prio != b->name->prio)
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return b->name->prio - a->name->prio;
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if (a->depth != b->depth)
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return a->depth - b->depth;
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if (a->found_order != b->found_order)
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return a->found_order - b->found_order;
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return 0;
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}
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static unsigned long finish_depth_computation(
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struct commit_list **list,
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struct possible_tag *best)
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{
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unsigned long seen_commits = 0;
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while (*list) {
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struct commit *c = pop_commit(list);
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struct commit_list *parents = c->parents;
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seen_commits++;
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if (c->object.flags & best->flag_within) {
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struct commit_list *a = *list;
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while (a) {
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struct commit *i = a->item;
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if (!(i->object.flags & best->flag_within))
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break;
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a = a->next;
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}
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if (!a)
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break;
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} else
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best->depth++;
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while (parents) {
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struct commit *p = parents->item;
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parse_commit(p);
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if (!(p->object.flags & SEEN))
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insert_by_date(p, list);
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p->object.flags |= c->object.flags;
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parents = parents->next;
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}
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}
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return seen_commits;
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}
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static void describe(const char *arg, int last_one)
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{
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unsigned char sha1[20];
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struct commit *cmit, *gave_up_on = NULL;
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struct commit_list *list;
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static int initialized = 0;
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struct commit_name *n;
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struct possible_tag all_matches[MAX_TAGS];
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unsigned int match_cnt = 0, annotated_cnt = 0, cur_match;
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unsigned long seen_commits = 0;
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if (get_sha1(arg, sha1))
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die("Not a valid object name %s", arg);
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cmit = lookup_commit_reference(sha1);
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if (!cmit)
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die("%s is not a valid '%s' object", arg, commit_type);
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if (!initialized) {
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initialized = 1;
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for_each_ref(get_name, NULL);
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}
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n = cmit->util;
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if (n) {
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printf("%s\n", n->path);
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return;
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}
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if (debug)
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fprintf(stderr, "searching to describe %s\n", arg);
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list = NULL;
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cmit->object.flags = SEEN;
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commit_list_insert(cmit, &list);
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while (list) {
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struct commit *c = pop_commit(&list);
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struct commit_list *parents = c->parents;
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seen_commits++;
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n = c->util;
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if (n) {
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if (match_cnt < max_candidates) {
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struct possible_tag *t = &all_matches[match_cnt++];
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t->name = n;
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t->depth = seen_commits - 1;
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t->flag_within = 1u << match_cnt;
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t->found_order = match_cnt;
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c->object.flags |= t->flag_within;
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if (n->prio == 2)
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annotated_cnt++;
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}
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else {
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gave_up_on = c;
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break;
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}
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}
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for (cur_match = 0; cur_match < match_cnt; cur_match++) {
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struct possible_tag *t = &all_matches[cur_match];
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if (!(c->object.flags & t->flag_within))
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t->depth++;
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}
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if (annotated_cnt && !list) {
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if (debug)
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fprintf(stderr, "finished search at %s\n",
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sha1_to_hex(c->object.sha1));
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break;
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}
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while (parents) {
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struct commit *p = parents->item;
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parse_commit(p);
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if (!(p->object.flags & SEEN))
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insert_by_date(p, &list);
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p->object.flags |= c->object.flags;
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parents = parents->next;
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}
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}
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if (!match_cnt)
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die("cannot describe '%s'", sha1_to_hex(cmit->object.sha1));
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qsort(all_matches, match_cnt, sizeof(all_matches[0]), compare_pt);
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if (gave_up_on) {
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insert_by_date(gave_up_on, &list);
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seen_commits--;
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}
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seen_commits += finish_depth_computation(&list, &all_matches[0]);
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free_commit_list(list);
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if (debug) {
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for (cur_match = 0; cur_match < match_cnt; cur_match++) {
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struct possible_tag *t = &all_matches[cur_match];
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fprintf(stderr, " %-11s %8d %s\n",
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prio_names[t->name->prio],
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t->depth, t->name->path);
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}
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fprintf(stderr, "traversed %lu commits\n", seen_commits);
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if (gave_up_on) {
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fprintf(stderr,
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"more than %i tags found; listed %i most recent\n"
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"gave up search at %s\n",
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max_candidates, max_candidates,
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sha1_to_hex(gave_up_on->object.sha1));
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}
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}
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if (abbrev == 0)
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printf("%s\n", all_matches[0].name->path );
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else
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printf("%s-%d-g%s\n", all_matches[0].name->path,
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all_matches[0].depth,
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find_unique_abbrev(cmit->object.sha1, abbrev));
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if (!last_one)
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clear_commit_marks(cmit, -1);
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}
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int cmd_describe(int argc, const char **argv, const char *prefix)
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{
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int i;
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for (i = 1; i < argc; i++) {
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const char *arg = argv[i];
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if (*arg != '-')
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break;
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else if (!strcmp(arg, "--debug"))
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debug = 1;
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else if (!strcmp(arg, "--all"))
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all = 1;
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else if (!strcmp(arg, "--tags"))
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tags = 1;
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else if (!prefixcmp(arg, "--abbrev=")) {
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abbrev = strtoul(arg + 9, NULL, 10);
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if (abbrev != 0 && (abbrev < MINIMUM_ABBREV || 40 < abbrev))
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abbrev = DEFAULT_ABBREV;
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}
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else if (!prefixcmp(arg, "--candidates=")) {
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max_candidates = strtoul(arg + 13, NULL, 10);
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if (max_candidates < 1)
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max_candidates = 1;
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else if (max_candidates > MAX_TAGS)
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max_candidates = MAX_TAGS;
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}
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else
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usage(describe_usage);
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}
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save_commit_buffer = 0;
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if (argc <= i)
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describe("HEAD", 1);
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else
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while (i < argc) {
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describe(argv[i], (i == argc - 1));
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i++;
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}
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return 0;
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}
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