gitk: Second try to work around the command line limit on Windows
[git/dscho.git] / builtin / stripspace.c
blob4d3b93fedb5f2eca68edca15ca1e10cb60176d36
1 #include "builtin.h"
2 #include "cache.h"
4 /*
5 * Returns the length of a line, without trailing spaces.
7 * If the line ends with newline, it will be removed too.
8 */
9 static size_t cleanup(char *line, size_t len)
11 while (len) {
12 unsigned char c = line[len - 1];
13 if (!isspace(c))
14 break;
15 len--;
18 return len;
22 * Remove empty lines from the beginning and end
23 * and also trailing spaces from every line.
25 * Note that the buffer will not be NUL-terminated.
27 * Turn multiple consecutive empty lines between paragraphs
28 * into just one empty line.
30 * If the input has only empty lines and spaces,
31 * no output will be produced.
33 * If last line does not have a newline at the end, one is added.
35 * Enable skip_comments to skip every line starting with "#".
37 void stripspace(struct strbuf *sb, int skip_comments)
39 int empties = 0;
40 size_t i, j, len, newlen;
41 char *eol;
43 /* We may have to add a newline. */
44 strbuf_grow(sb, 1);
46 for (i = j = 0; i < sb->len; i += len, j += newlen) {
47 eol = memchr(sb->buf + i, '\n', sb->len - i);
48 len = eol ? eol - (sb->buf + i) + 1 : sb->len - i;
50 if (skip_comments && len && sb->buf[i] == '#') {
51 newlen = 0;
52 continue;
54 newlen = cleanup(sb->buf + i, len);
56 /* Not just an empty line? */
57 if (newlen) {
58 if (empties > 0 && j > 0)
59 sb->buf[j++] = '\n';
60 empties = 0;
61 memmove(sb->buf + j, sb->buf + i, newlen);
62 sb->buf[newlen + j++] = '\n';
63 } else {
64 empties++;
68 strbuf_setlen(sb, j);
71 int cmd_stripspace(int argc, const char **argv, const char *prefix)
73 struct strbuf buf = STRBUF_INIT;
74 int strip_comments = 0;
76 if (argc == 2 && (!strcmp(argv[1], "-s") ||
77 !strcmp(argv[1], "--strip-comments")))
78 strip_comments = 1;
79 else if (argc > 1)
80 usage("git stripspace [-s | --strip-comments] < <stream>");
82 if (strbuf_read(&buf, 0, 1024) < 0)
83 die_errno("could not read the input");
85 stripspace(&buf, strip_comments);
87 write_or_die(1, buf.buf, buf.len);
88 strbuf_release(&buf);
89 return 0;