/* $OpenBSD: expand.c,v 1.12 2013/11/26 13:18:55 deraadt Exp $ */ /* $NetBSD: expand.c,v 1.5 1995/09/02 06:19:46 jtc Exp $ */ /* * Copyright (c) 1980, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #include #include #include #include /* * expand - expand tabs to equivalent spaces */ int nstops; int tabstops[100]; static void getstops(char *); static void usage(void); int main(int argc, char *argv[]) { int c, column; int n; /* handle obsolete syntax */ while (argc > 1 && argv[1][0] == '-' && isdigit((unsigned char)argv[1][1])) { getstops(&argv[1][1]); argc--; argv++; } while ((c = getopt (argc, argv, "t:")) != -1) { switch (c) { case 't': getstops(optarg); break; case '?': default: usage(); /* NOTREACHED */ } } argc -= optind; argv += optind; do { if (argc > 0) { if (freopen(argv[0], "r", stdin) == NULL) err(1, "%s", argv[0]); argc--, argv++; } column = 0; while ((c = getchar()) != EOF) { switch (c) { case '\t': if (nstops == 0) { do { putchar(' '); column++; } while (column & 07); continue; } if (nstops == 1) { do { putchar(' '); column++; } while (((column - 1) % tabstops[0]) != (tabstops[0] - 1)); continue; } for (n = 0; n < nstops; n++) if (tabstops[n] > column) break; if (n == nstops) { putchar(' '); column++; continue; } while (column < tabstops[n]) { putchar(' '); column++; } continue; case '\b': if (column) column--; putchar('\b'); continue; default: putchar(c); column++; continue; case '\n': putchar(c); column = 0; continue; } } } while (argc > 0); exit(0); } static void getstops(char *cp) { int i; nstops = 0; for (;;) { i = 0; while (*cp >= '0' && *cp <= '9') i = i * 10 + *cp++ - '0'; if (i <= 0 || i > 256) { bad: errx(1, "Bad tab stop spec"); } if (nstops > 0 && i <= tabstops[nstops-1]) goto bad; if (nstops >= sizeof(tabstops) / sizeof(tabstops[0])) errx(1, "Too many tab stops"); tabstops[nstops++] = i; if (*cp == 0) break; if (*cp != ',' && *cp != ' ') goto bad; cp++; } } static void usage(void) { extern char *__progname; fprintf (stderr, "usage: %s [-t tablist] [file ...]\n", __progname); exit(1); }