126 lines
2.1 KiB
C
126 lines
2.1 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <limits.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 "utf.h"
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#include "util.h"
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static int iflag = 0;
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static size_t *tablist = NULL;
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static size_t tablistlen = 0;
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static size_t
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parselist(const char *s)
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{
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size_t i;
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char *p, *tmp;
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tmp = estrdup(s);
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for (i = 0; (p = strsep(&tmp, " ,")); i++) {
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if (*p == '\0')
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eprintf("empty field in tablist\n");
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tablist = erealloc(tablist, (i + 1) * sizeof(*tablist));
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tablist[i] = estrtonum(p, 1, MIN(LLONG_MAX, SIZE_MAX));
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if (i > 0 && tablist[i - 1] >= tablist[i])
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eprintf("tablist must be ascending\n");
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}
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tablist = erealloc(tablist, (i + 1) * sizeof(*tablist));
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/* tab length = 1 for the overflowing case later in the matcher */
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tablist[i] = 1;
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return i;
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}
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static int
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expand(const char *file, FILE *fp)
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{
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size_t bol = 1, col = 0, i;
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Rune r;
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while (readrune(file, fp, &r)) {
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switch (r) {
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case '\t':
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if (tablistlen == 1)
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i = 0;
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else for (i = 0; i < tablistlen; i++)
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if (col < tablist[i])
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break;
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if (bol || !iflag) {
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do {
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col++;
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putchar(' ');
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} while (col % tablist[i]);
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} else {
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putchar('\t');
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col = tablist[i];
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}
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break;
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case '\b':
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bol = 0;
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if (col)
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col--;
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putchar('\b');
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break;
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case '\n':
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bol = 1;
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col = 0;
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putchar('\n');
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break;
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default:
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col++;
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if (r != ' ')
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bol = 0;
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writerune("<stdout>", stdout, &r);
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break;
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}
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}
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return 0;
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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 [-i] [-t tablist] [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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char *tl = "8";
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int ret = 0;
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ARGBEGIN {
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case 'i':
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iflag = 1;
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break;
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case 't':
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tl = EARGF(usage());
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if (!*tl)
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eprintf("tablist cannot be empty\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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tablistlen = parselist(tl);
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if (argc == 0)
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expand("<stdin>", stdin);
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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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ret = 1;
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continue;
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}
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expand(argv[0], fp);
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fclose(fp);
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}
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}
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return ret;
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}
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