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![Junio C Hamano](/assets/img/avatar_default.png)
Code clean-up. * rs/patch-id-use-skip-prefix: patch-id: use starts_with() and skip_prefix()
199 lines
4 KiB
C
199 lines
4 KiB
C
#include "builtin.h"
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static void flush_current_id(int patchlen, struct object_id *id, struct object_id *result)
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{
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char name[50];
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if (!patchlen)
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return;
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memcpy(name, oid_to_hex(id), GIT_SHA1_HEXSZ + 1);
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printf("%s %s\n", oid_to_hex(result), name);
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}
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static int remove_space(char *line)
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{
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char *src = line;
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char *dst = line;
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unsigned char c;
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while ((c = *src++) != '\0') {
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if (!isspace(c))
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*dst++ = c;
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}
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return dst - line;
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}
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static int scan_hunk_header(const char *p, int *p_before, int *p_after)
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{
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static const char digits[] = "0123456789";
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const char *q, *r;
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int n;
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q = p + 4;
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n = strspn(q, digits);
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if (q[n] == ',') {
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q += n + 1;
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n = strspn(q, digits);
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}
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if (n == 0 || q[n] != ' ' || q[n+1] != '+')
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return 0;
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r = q + n + 2;
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n = strspn(r, digits);
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if (r[n] == ',') {
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r += n + 1;
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n = strspn(r, digits);
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}
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if (n == 0)
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return 0;
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*p_before = atoi(q);
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*p_after = atoi(r);
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return 1;
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}
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static void flush_one_hunk(struct object_id *result, git_SHA_CTX *ctx)
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{
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unsigned char hash[GIT_SHA1_RAWSZ];
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unsigned short carry = 0;
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int i;
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git_SHA1_Final(hash, ctx);
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git_SHA1_Init(ctx);
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/* 20-byte sum, with carry */
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for (i = 0; i < GIT_SHA1_RAWSZ; ++i) {
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carry += result->hash[i] + hash[i];
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result->hash[i] = carry;
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carry >>= 8;
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}
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}
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static int get_one_patchid(struct object_id *next_oid, struct object_id *result,
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struct strbuf *line_buf, int stable)
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{
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int patchlen = 0, found_next = 0;
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int before = -1, after = -1;
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git_SHA_CTX ctx;
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git_SHA1_Init(&ctx);
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oidclr(result);
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while (strbuf_getwholeline(line_buf, stdin, '\n') != EOF) {
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char *line = line_buf->buf;
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const char *p = line;
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int len;
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if (!skip_prefix(line, "diff-tree ", &p) &&
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!skip_prefix(line, "commit ", &p) &&
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!skip_prefix(line, "From ", &p) &&
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starts_with(line, "\\ ") && 12 < strlen(line))
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continue;
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if (!get_oid_hex(p, next_oid)) {
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found_next = 1;
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break;
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}
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/* Ignore commit comments */
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if (!patchlen && !starts_with(line, "diff "))
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continue;
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/* Parsing diff header? */
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if (before == -1) {
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if (starts_with(line, "index "))
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continue;
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else if (starts_with(line, "--- "))
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before = after = 1;
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else if (!isalpha(line[0]))
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break;
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}
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/* Looking for a valid hunk header? */
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if (before == 0 && after == 0) {
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if (starts_with(line, "@@ -")) {
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/* Parse next hunk, but ignore line numbers. */
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scan_hunk_header(line, &before, &after);
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continue;
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}
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/* Split at the end of the patch. */
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if (!starts_with(line, "diff "))
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break;
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/* Else we're parsing another header. */
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if (stable)
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flush_one_hunk(result, &ctx);
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before = after = -1;
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}
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/* If we get here, we're inside a hunk. */
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if (line[0] == '-' || line[0] == ' ')
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before--;
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if (line[0] == '+' || line[0] == ' ')
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after--;
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/* Compute the sha without whitespace */
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len = remove_space(line);
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patchlen += len;
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git_SHA1_Update(&ctx, line, len);
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}
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if (!found_next)
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oidclr(next_oid);
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flush_one_hunk(result, &ctx);
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return patchlen;
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}
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static void generate_id_list(int stable)
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{
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struct object_id oid, n, result;
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int patchlen;
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struct strbuf line_buf = STRBUF_INIT;
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oidclr(&oid);
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while (!feof(stdin)) {
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patchlen = get_one_patchid(&n, &result, &line_buf, stable);
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flush_current_id(patchlen, &oid, &result);
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oidcpy(&oid, &n);
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}
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strbuf_release(&line_buf);
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}
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static const char patch_id_usage[] = "git patch-id [--stable | --unstable]";
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static int git_patch_id_config(const char *var, const char *value, void *cb)
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{
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int *stable = cb;
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if (!strcmp(var, "patchid.stable")) {
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*stable = git_config_bool(var, value);
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return 0;
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}
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return git_default_config(var, value, cb);
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}
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int cmd_patch_id(int argc, const char **argv, const char *prefix)
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{
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int stable = -1;
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git_config(git_patch_id_config, &stable);
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/* If nothing is set, default to unstable. */
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if (stable < 0)
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stable = 0;
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if (argc == 2 && !strcmp(argv[1], "--stable"))
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stable = 1;
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else if (argc == 2 && !strcmp(argv[1], "--unstable"))
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stable = 0;
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else if (argc != 1)
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usage(patch_id_usage);
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generate_id_list(stable);
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return 0;
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}
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