sbase/fold.c

111 lines
1.7 KiB
C

/* See LICENSE file for copyright and license details. */
#include <ctype.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include "util.h"
static int bflag = 0;
static int sflag = 0;
static void
foldline(const char *str, size_t width)
{
int space;
size_t i = 0, n = 0, col, j;
char c;
do {
space = 0;
for (j = i, col = 0; str[j] && col <= width; j++) {
c = str[j];
if (!UTF8_POINT(c) && !bflag)
continue;
if (sflag && isspace(c)) {
space = 1;
n = j + 1;
}
else if (!space)
n = j;
if (!bflag && iscntrl(c))
switch(c) {
case '\b':
col--;
break;
case '\r':
col = 0;
break;
case '\t':
col += (col + 1) % 8;
break;
}
else
col++;
}
if (fwrite(&str[i], 1, n - i, stdout) != n - i)
eprintf("<stdout>: write error:");
if (str[n])
putchar('\n');
} while (str[i = n] && str[i] != '\n');
}
static void
fold(FILE *fp, size_t width)
{
char *buf = NULL;
size_t size = 0;
while (getline(&buf, &size, fp) != -1)
foldline(buf, width);
free(buf);
}
static void
usage(void)
{
eprintf("usage: %s [-bs] [-w width | -width] [FILE...]\n", argv0);
}
int
main(int argc, char *argv[])
{
size_t width = 80;
FILE *fp;
int r = 0;
ARGBEGIN {
case 'b':
bflag = 1;
break;
case 's':
sflag = 1;
break;
case 'w':
width = estrtonum(EARGF(usage()), 1, MIN(LLONG_MAX, SIZE_MAX));
break;
ARGNUM:
width = ARGNUMF();
break;
default:
usage();
} ARGEND;
if (argc == 0) {
fold(stdin, width);
} else {
for (; argc > 0; argc--, argv++) {
if (!(fp = fopen(argv[0], "r"))) {
weprintf("fopen %s:", argv[0]);
r = 1;
continue;
}
fold(fp, width);
fclose(fp);
}
}
return r;
}