111 lines
1.7 KiB
C
111 lines
1.7 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 "util.h"
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static int bflag = 0;
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static int sflag = 0;
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static void
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foldline(const char *str, size_t width)
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{
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int space;
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size_t i = 0, n = 0, col, j;
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char c;
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do {
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space = 0;
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for (j = i, col = 0; str[j] && col <= width; j++) {
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c = str[j];
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if (!UTF8_POINT(c) && !bflag)
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continue;
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if (sflag && isspace(c)) {
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space = 1;
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n = j + 1;
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}
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else if (!space)
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n = j;
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if (!bflag && iscntrl(c))
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switch(c) {
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case '\b':
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col--;
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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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if (fwrite(&str[i], 1, n - i, stdout) != n - i)
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eprintf("<stdout>: write error:");
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if (str[n])
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putchar('\n');
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} while (str[i = n] && str[i] != '\n');
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}
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static void
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fold(FILE *fp, size_t width)
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{
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char *buf = NULL;
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size_t size = 0;
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while (getline(&buf, &size, fp) != -1)
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foldline(buf, width);
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free(buf);
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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 width] [-N] [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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size_t width = 80;
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FILE *fp;
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int r = 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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width = ARGNUMF();
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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 == 0) {
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fold(stdin, width);
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} else {
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for (; argc > 0; argc--, argv++) {
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if (!(fp = fopen(argv[0], "r"))) {
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weprintf("fopen %s:", argv[0]);
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r = 1;
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continue;
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}
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fold(fp, width);
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fclose(fp);
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}
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}
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return r;
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}
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