diff options
Diffstat (limited to 'usr.bin/expand/expand.c')
-rw-r--r-- | usr.bin/expand/expand.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/usr.bin/expand/expand.c b/usr.bin/expand/expand.c new file mode 100644 index 0000000..c3a00e7 --- /dev/null +++ b/usr.bin/expand/expand.c @@ -0,0 +1,152 @@ +/* + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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. + */ + +#ifndef lint +static char copyright[] = +"@(#) Copyright (c) 1980, 1993\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#ifndef lint +static char sccsid[] = "@(#)expand.c 8.1 (Berkeley) 6/9/93"; +#endif /* not lint */ + +#include <stdio.h> +/* + * expand - expand tabs to equivalent spaces + */ +int nstops; +int tabstops[100]; + +main(argc, argv) + int argc; + char *argv[]; +{ + register int c, column; + register int n; + + argc--, argv++; + do { + while (argc > 0 && argv[0][0] == '-') { + getstops(argv[0]); + argc--, argv++; + } + if (argc > 0) { + if (freopen(argv[0], "r", stdin) == NULL) { + perror(argv[0]); + exit(1); + } + argc--, argv++; + } + column = 0; + for (;;) { + c = getc(stdin); + if (c == -1) + break; + 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); +} + +getstops(cp) + register char *cp; +{ + register int i; + + nstops = 0; + cp++; + for (;;) { + i = 0; + while (*cp >= '0' && *cp <= '9') + i = i * 10 + *cp++ - '0'; + if (i <= 0 || i > 256) { +bad: + fprintf(stderr, "Bad tab stop spec\n"); + exit(1); + } + if (nstops > 0 && i <= tabstops[nstops-1]) + goto bad; + tabstops[nstops++] = i; + if (*cp == 0) + break; + if (*cp++ != ',') + goto bad; + } +} |