9690c118fa
Now the implementation gets more memory to store completely each line before removing trailing spaces, and does it right when the last line of the file ends with spaces and no newline at the end. Function stripspace needs again to be non-static in order to call it from "builtin-tag.c" and the upcoming "builtin-commit.c". A new parameter skip_comments was also added to the stripspace function to optionally strips every shell #comment from the input, needed for doing this task on those programs. Signed-off-by: Carlos Rica <jasampler@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
80 lines
1.5 KiB
C
80 lines
1.5 KiB
C
#include "builtin.h"
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#include "cache.h"
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/*
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* Remove trailing spaces from a line.
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*
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* If the line ends with newline, it will be removed too.
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* Returns the new length of the string.
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*/
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static int cleanup(char *line, int len)
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{
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if (len) {
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if (line[len - 1] == '\n')
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len--;
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while (len) {
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unsigned char c = line[len - 1];
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if (!isspace(c))
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break;
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len--;
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}
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line[len] = 0;
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}
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return len;
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}
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/*
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* Remove empty lines from the beginning and end
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* and also trailing spaces from every line.
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*
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* Turn multiple consecutive empty lines between paragraphs
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* into just one empty line.
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*
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* If the input has only empty lines and spaces,
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* no output will be produced.
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*
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* Enable skip_comments to skip every line starting with "#".
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*/
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void stripspace(FILE *in, FILE *out, int skip_comments)
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{
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int empties = -1;
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int alloc = 1024;
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char *line = xmalloc(alloc);
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while (fgets(line, alloc, in)) {
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int len = strlen(line);
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while (len == alloc - 1 && line[len - 1] != '\n') {
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alloc = alloc_nr(alloc);
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line = xrealloc(line, alloc);
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fgets(line + len, alloc - len, in);
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len += strlen(line + len);
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}
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if (skip_comments && line[0] == '#')
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continue;
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len = cleanup(line, len);
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/* Not just an empty line? */
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if (len) {
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if (empties > 0)
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fputc('\n', out);
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empties = 0;
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fputs(line, out);
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fputc('\n', out);
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continue;
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}
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if (empties < 0)
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continue;
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empties++;
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}
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free(line);
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}
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int cmd_stripspace(int argc, const char **argv, const char *prefix)
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{
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stripspace(stdin, stdout, 0);
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return 0;
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}
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