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message.c

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/*

* Copyright (C) the libgit2 contributors. All rights reserved.

*

* This file is part of libgit2, distributed under the GNU GPL v2 with

* a Linking Exception. For full terms see the included COPYING file.

*/

#include "message.h"

static size_t line_length_without_trailing_spaces(const char *line, size_t len)

{

while (len) {

unsigned char c = line[len - 1];

if (!git__isspace(c))

break;

len--;

}

return len;

}

/* Greatly inspired from git.git "stripspace" */

/* see https://github.com/git/git/blob/497215d8811ac7b8955693ceaad0899ecd894ed2/builtin/stripspace.c#L4-67 */

int git_message__prettify(git_buf *message_out, const char *message, int strip_comments)

{

const size_t message_len = strlen(message);

int consecutive_empty_lines = 0;

size_t i, line_length, rtrimmed_line_length;

char *next_newline;

for (i = 0; i < strlen(message); i += line_length) {

next_newline = memchr(message + i, '\n', message_len - i);

if (next_newline != NULL) {

line_length = next_newline - (message + i) + 1;

} else {

line_length = message_len - i;

}

if (strip_comments && line_length && message[i] == '#')

continue;

rtrimmed_line_length = line_length_without_trailing_spaces(message + i, line_length);

if (!rtrimmed_line_length) {

consecutive_empty_lines++;

continue;

}

if (consecutive_empty_lines > 0 && message_out->size > 0)

git_buf_putc(message_out, '\n');

consecutive_empty_lines = 0;

git_buf_put(message_out, message + i, rtrimmed_line_length);

git_buf_putc(message_out, '\n');

}

return git_buf_oom(message_out) ? -1 : 0;

}

int git_message_prettify(char *message_out, size_t buffer_size, const char *message, int strip_comments)

{

git_buf buf = GIT_BUF_INIT;

ssize_t out_size = -1;

if (message_out && buffer_size)

*message_out = '\0';

if (git_message__prettify(&buf, message, strip_comments) < 0)

goto done;

if (message_out && buf.size + 1 > buffer_size) { /* +1 for NUL byte */

giterr_set(GITERR_INVALID, "Buffer too short to hold the cleaned message");

goto done;

}

if (message_out)

git_buf_copy_cstr(message_out, buffer_size, &buf);

out_size = buf.size + 1;

done:

git_buf_free(&buf);

return (int)out_size;

}