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Commit | Line | Data |
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7499c996 | 1 | #include "builtin.h" |
9690c118 | 2 | #include "cache.h" |
a3e870f2 LT |
3 | |
4 | /* | |
9690c118 | 5 | * Remove trailing spaces from a line. |
a3e870f2 | 6 | * |
9690c118 CR |
7 | * If the line ends with newline, it will be removed too. |
8 | * Returns the new length of the string. | |
a3e870f2 | 9 | */ |
9690c118 | 10 | static int cleanup(char *line, int len) |
a3e870f2 | 11 | { |
9690c118 CR |
12 | if (len) { |
13 | if (line[len - 1] == '\n') | |
14 | len--; | |
a3e870f2 | 15 | |
9690c118 CR |
16 | while (len) { |
17 | unsigned char c = line[len - 1]; | |
a3e870f2 LT |
18 | if (!isspace(c)) |
19 | break; | |
a3e870f2 | 20 | len--; |
9690c118 CR |
21 | } |
22 | line[len] = 0; | |
a3e870f2 | 23 | } |
9690c118 | 24 | return len; |
a3e870f2 LT |
25 | } |
26 | ||
9690c118 CR |
27 | /* |
28 | * Remove empty lines from the beginning and end | |
29 | * and also trailing spaces from every line. | |
30 | * | |
31 | * Turn multiple consecutive empty lines between paragraphs | |
32 | * into just one empty line. | |
33 | * | |
34 | * If the input has only empty lines and spaces, | |
35 | * no output will be produced. | |
36 | * | |
37 | * Enable skip_comments to skip every line starting with "#". | |
38 | */ | |
39 | void stripspace(FILE *in, FILE *out, int skip_comments) | |
a3e870f2 LT |
40 | { |
41 | int empties = -1; | |
9690c118 CR |
42 | int alloc = 1024; |
43 | char *line = xmalloc(alloc); | |
44 | ||
45 | while (fgets(line, alloc, in)) { | |
46 | int len = strlen(line); | |
a3e870f2 | 47 | |
9690c118 CR |
48 | while (len == alloc - 1 && line[len - 1] != '\n') { |
49 | alloc = alloc_nr(alloc); | |
50 | line = xrealloc(line, alloc); | |
51 | fgets(line + len, alloc - len, in); | |
52 | len += strlen(line + len); | |
53 | } | |
54 | ||
55 | if (skip_comments && line[0] == '#') | |
56 | continue; | |
57 | len = cleanup(line, len); | |
a3e870f2 LT |
58 | |
59 | /* Not just an empty line? */ | |
9690c118 | 60 | if (len) { |
a3e870f2 | 61 | if (empties > 0) |
7499c996 | 62 | fputc('\n', out); |
a3e870f2 | 63 | empties = 0; |
7499c996 | 64 | fputs(line, out); |
9690c118 | 65 | fputc('\n', out); |
a3e870f2 LT |
66 | continue; |
67 | } | |
68 | if (empties < 0) | |
69 | continue; | |
70 | empties++; | |
71 | } | |
9690c118 | 72 | free(line); |
7499c996 LS |
73 | } |
74 | ||
a633fca0 | 75 | int cmd_stripspace(int argc, const char **argv, const char *prefix) |
7499c996 | 76 | { |
9690c118 | 77 | stripspace(stdin, stdout, 0); |
a3e870f2 LT |
78 | return 0; |
79 | } |