120 lines
2.2 KiB
C
120 lines
2.2 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <ctype.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "text.h"
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#include "util.h"
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static int bflag = 0;
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static int sflag = 0;
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static size_t width = 80;
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static void
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foldline(struct line *l) {
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size_t i, col, last, spacesect, len;
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for (i = 0, last = 0, col = 0, spacesect = 0; i < l->len; i++) {
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if (!UTF8_POINT(l->data[i]) && !bflag)
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continue;
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if (col >= width) {
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len = ((sflag && spacesect) ? spacesect : i) - last;
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if (fwrite(l->data + last, 1, len, stdout) != len)
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eprintf("fwrite <stdout>:");
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putchar('\n');
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last = (sflag && spacesect) ? spacesect : i;
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col = 0;
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spacesect = 0;
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}
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if (sflag && isspace(l->data[i]))
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spacesect = i + 1;
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if (!bflag && iscntrl(l->data[i])) {
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switch(l->data[i]) {
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case '\b':
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col -= (col > 0);
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break;
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case '\r':
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col = 0;
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break;
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case '\t':
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col += (col + 1) % 8;
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break;
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}
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} else {
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col++;
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}
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}
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if (l->len - last)
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fwrite(l->data + last, 1, l->len - last, stdout);
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}
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static void
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fold(FILE *fp, const char *fname)
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{
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static struct line line;
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static size_t size = 0;
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ssize_t len;
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while ((len = getline(&line.data, &size, fp)) > 0) {
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line.len = len;
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foldline(&line);
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}
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if (ferror(fp))
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eprintf("getline %s:", fname);
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}
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static void
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usage(void)
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{
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eprintf("usage: %s [-bs] [-w num | -num] [FILE ...]\n", argv0);
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}
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int
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main(int argc, char *argv[])
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{
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FILE *fp;
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int ret = 0;
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ARGBEGIN {
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case 'b':
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bflag = 1;
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break;
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case 's':
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sflag = 1;
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break;
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case 'w':
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width = estrtonum(EARGF(usage()), 1, MIN(LLONG_MAX, SIZE_MAX));
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break;
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ARGNUM:
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if (!(width = ARGNUMF()))
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eprintf("illegal width value, too small\n");
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break;
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default:
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usage();
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} ARGEND
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if (!argc) {
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fold(stdin, "<stdin>");
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} else {
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for (; *argv; argc--, argv++) {
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if (!strcmp(*argv, "-")) {
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*argv = "<stdin>";
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fp = stdin;
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} else if (!(fp = fopen(*argv, "r"))) {
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weprintf("fopen %s:", *argv);
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ret = 1;
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continue;
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}
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fold(fp, *argv);
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if (fp != stdin && fshut(fp, *argv))
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ret = 1;
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}
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}
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ret |= fshut(stdin, "<stdin>") | fshut(stdout, "<stdout>");
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return ret;
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}
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