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#include "builtin.h"
#include "cache.h"
/*
* Returns the length of a line, without trailing spaces.
*
* If the line ends with newline, it will be removed too.
*/
static size_t cleanup(char *line, size_t len)
{
if (len) {
if (line[len - 1] == '\n')
len--;
while (len) {
unsigned char c = line[len - 1];
if (!isspace(c))
break;
len--;
}
}
return len;
}
/*
* Remove empty lines from the beginning and end
* and also trailing spaces from every line.
*
* Note that the buffer will not be NUL-terminated.
*
* Turn multiple consecutive empty lines between paragraphs
* into just one empty line.
*
* If the input has only empty lines and spaces,
* no output will be produced.
*
* If last line has a newline at the end, it will be removed.
*
* Enable skip_comments to skip every line starting with "#".
*/
size_t stripspace(char *buffer, size_t length, int skip_comments)
{
int empties = -1;
size_t i, j, len, newlen;
char *eol;
for (i = j = 0; i < length; i += len, j += newlen) {
eol = memchr(buffer + i, '\n', length - i);
len = eol ? eol - (buffer + i) + 1 : length - i;
if (skip_comments && len && buffer[i] == '#') {
newlen = 0;
continue;
}
newlen = cleanup(buffer + i, len);
/* Not just an empty line? */
if (newlen) {
if (empties != -1)
buffer[j++] = '\n';
if (empties > 0)
buffer[j++] = '\n';
empties = 0;
memmove(buffer + j, buffer + i, newlen);
continue;
}
if (empties < 0)
continue;
empties++;
}
return j;
}
int cmd_stripspace(int argc, const char **argv, const char *prefix)
{
char *buffer;
unsigned long size;
int strip_comments = 0;
if (argc > 1 && (!strcmp(argv[1], "-s") ||
!strcmp(argv[1], "--strip-comments")))
strip_comments = 1;
size = 1024;
buffer = xmalloc(size);
if (read_fd(0, &buffer, &size)) {
free(buffer);
die("could not read the input");
}
size = stripspace(buffer, size, strip_comments);
write_or_die(1, buffer, size);
if (size)
putc('\n', stdout);
free(buffer);
return 0;
}
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