/* $OpenBSD: uniq.c,v 1.19 2013/11/26 19:25:39 deraadt Exp $ */ /* $NetBSD: uniq.c,v 1.7 1995/08/31 22:03:48 jtc Exp $ */ /* * Copyright (c) 1989, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Case Larsen. * * 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 #include #include #include #define MAXLINELEN (8 * 1024) int cflag, dflag, uflag; int numchars, numfields, repeats; FILE *file(char *, char *); void show(FILE *, char *); char *skip(char *); void obsolete(char *[]); __dead void usage(void); int main(int argc, char *argv[]) { char *t1, *t2; FILE *ifp = NULL, *ofp = NULL; int ch; char *prevline, *thisline; obsolete(argv); while ((ch = getopt(argc, argv, "cdf:s:u")) != -1) { const char *errstr; switch (ch) { case 'c': cflag = 1; break; case 'd': dflag = 1; break; case 'f': numfields = (int)strtonum(optarg, 0, INT_MAX, &errstr); if (errstr) errx(1, "field skip value is %s: %s", errstr, optarg); break; case 's': numchars = (int)strtonum(optarg, 0, INT_MAX, &errstr); if (errstr) errx(1, "character skip value is %s: %s", errstr, optarg); break; case 'u': uflag = 1; break; default: usage(); } } argc -= optind; argv += optind; /* If neither -d nor -u are set, default is -d -u. */ if (!dflag && !uflag) dflag = uflag = 1; switch(argc) { case 0: ifp = stdin; ofp = stdout; break; case 1: ifp = file(argv[0], "r"); ofp = stdout; break; case 2: ifp = file(argv[0], "r"); ofp = file(argv[1], "w"); break; default: usage(); } prevline = malloc(MAXLINELEN); thisline = malloc(MAXLINELEN); if (prevline == NULL || thisline == NULL) err(1, "malloc"); if (fgets(prevline, MAXLINELEN, ifp) == NULL) exit(0); while (fgets(thisline, MAXLINELEN, ifp)) { /* If requested get the chosen fields + character offsets. */ if (numfields || numchars) { t1 = skip(thisline); t2 = skip(prevline); } else { t1 = thisline; t2 = prevline; } /* If different, print; set previous to new value. */ if (strcmp(t1, t2)) { show(ofp, prevline); t1 = prevline; prevline = thisline; thisline = t1; repeats = 0; } else ++repeats; } show(ofp, prevline); exit(0); } /* * show -- * Output a line depending on the flags and number of repetitions * of the line. */ void show(FILE *ofp, char *str) { if ((dflag && repeats) || (uflag && !repeats)) { if (cflag) (void)fprintf(ofp, "%4d %s", repeats + 1, str); else (void)fprintf(ofp, "%s", str); } } char * skip(char *str) { int nchars, nfields; for (nfields = numfields; nfields && *str; nfields--) { while (isblank((unsigned char)*str)) str++; while (*str && !isblank((unsigned char)*str)) str++; } for (nchars = numchars; nchars-- && *str && *str != '\n'; ++str) ; return (str); } FILE * file(char *name, char *mode) { FILE *fp; if (strcmp(name, "-") == 0) return(*mode == 'r' ? stdin : stdout); if ((fp = fopen(name, mode)) == NULL) err(1, "%s", name); return (fp); } void obsolete(char *argv[]) { size_t len; char *ap, *p, *start; while ((ap = *++argv)) { /* Return if "--" or not an option of any form. */ if (ap[0] != '-') { if (ap[0] != '+') return; } else if (ap[1] == '-') return; if (!isdigit(ap[1])) continue; /* * Digit signifies an old-style option. Malloc space for dash, * new option and argument. */ len = strlen(ap) + 3; if ((start = p = malloc(len)) == NULL) err(1, "malloc"); *p++ = '-'; *p++ = ap[0] == '+' ? 's' : 'f'; (void)strlcpy(p, ap + 1, len - 2); *argv = start; } } __dead void usage(void) { extern char *__progname; (void)fprintf(stderr, "usage: %s [-c] [-d | -u] [-f fields] [-s chars] [input_file [output_file]]\n", __progname); exit(1); }