/* $OpenBSD: seq.c,v 1.6 2022/02/25 16:00:39 tb Exp $ */ /*- * Copyright (c) 2005 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Brian Ginsbach. * * 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. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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 #include #include #define VERSION "1.0" #define ZERO '0' #define SPACE ' ' #define MAXIMUM(a, b) (((a) < (b))? (b) : (a)) #define ISSIGN(c) ((int)(c) == '-' || (int)(c) == '+') #define ISEXP(c) ((int)(c) == 'e' || (int)(c) == 'E') #define ISODIGIT(c) ((int)(c) >= '0' && (int)(c) <= '7') /* Globals */ static const char *decimal_point = "."; /* default */ static char default_format[] = { "%g" }; /* default */ static const struct option long_opts[] = { {"format", required_argument, NULL, 'f'}, {"help", no_argument, NULL, 'h'}, {"separator", required_argument, NULL, 's'}, {"version", no_argument, NULL, 'v'}, {"equal-width", no_argument, NULL, 'w'}, {NULL, no_argument, NULL, 0} }; /* Prototypes */ static double e_atof(const char *); static int decimal_places(const char *); static int numeric(const char *); static int valid_format(const char *); static char *generate_format(double, double, double, int, char); static __dead void usage(int error); /* * The seq command will print out a numeric sequence from 1, the default, * to a user specified upper limit by 1. The lower bound and increment * maybe indicated by the user on the command line. The sequence can * be either whole, the default, or decimal numbers. */ int main(int argc, char *argv[]) { int c = 0; int equalize = 0; double first = 1.0; double last = 0.0; double incr = 0.0; double last_shown_value = 0.0; double cur, step; struct lconv *locale; char *fmt = NULL; const char *sep = "\n"; const char *term = "\n"; char *cur_print, *last_print; char pad = ZERO; if (pledge("stdio", NULL) == -1) err(1, "pledge"); /* Determine the locale's decimal point. */ locale = localeconv(); if (locale && locale->decimal_point && locale->decimal_point[0] != '\0') decimal_point = locale->decimal_point; /* * Process options, but handle negative numbers separately * least they trip up getopt(3). */ while ((optind < argc) && !numeric(argv[optind]) && (c = getopt_long(argc, argv, "+f:s:w", long_opts, NULL)) != -1) { switch (c) { case 'f': /* format (plan9/GNU) */ fmt = optarg; equalize = 0; break; case 's': /* separator (GNU) */ sep = optarg; break; case 'v': /* version (GNU) */ printf("seq version %s\n", VERSION); return 0; case 'w': /* equal width (plan9/GNU) */ if (fmt == NULL) { if (equalize++) pad = SPACE; } break; case 'h': /* help (GNU) */ usage(0); break; default: usage(1); break; } } argc -= optind; argv += optind; if (argc < 1 || argc > 3) usage(1); last = e_atof(argv[argc - 1]); if (argc > 1) first = e_atof(argv[0]); if (argc > 2) { incr = e_atof(argv[1]); /* Plan 9/GNU don't do zero */ if (incr == 0.0) errx(1, "zero %screment", (first < last) ? "in" : "de"); } /* default is one for Plan 9/GNU work alike */ if (incr == 0.0) incr = (first < last) ? 1.0 : -1.0; if (incr <= 0.0 && first < last) errx(1, "needs positive increment"); if (incr >= 0.0 && first > last) errx(1, "needs negative decrement"); if (fmt != NULL) { if (!valid_format(fmt)) errx(1, "invalid format string: `%s'", fmt); /* * XXX to be bug for bug compatible with Plan 9 add a * newline if none found at the end of the format string. */ } else fmt = generate_format(first, incr, last, equalize, pad); for (step = 1, cur = first; incr > 0 ? cur <= last : cur >= last; cur = first + incr * step++) { if (cur != first) fputs(sep, stdout); printf(fmt, cur); last_shown_value = cur; } /* * Did we miss the last value of the range in the loop above? * * We might have, so check if the printable version of the last * computed value ('cur') and desired 'last' value are equal. If they * are equal after formatting truncation, but 'cur' and * 'last_shown_value' are not equal, it means the exit condition of the * loop held true due to a rounding error and we still need to print * 'last'. */ if (asprintf(&cur_print, fmt, cur) == -1 || asprintf(&last_print, fmt, last) == -1) err(1, "asprintf"); if (strcmp(cur_print, last_print) == 0 && cur != last_shown_value) { if (cur != first) fputs(sep, stdout); fputs(last_print, stdout); } free(cur_print); free(last_print); fputs(term, stdout); return 0; } /* * numeric - verify that string is numeric */ static int numeric(const char *s) { int seen_decimal_pt, decimal_pt_len; /* skip any sign */ if (ISSIGN((unsigned char)*s)) s++; seen_decimal_pt = 0; decimal_pt_len = strlen(decimal_point); while (*s) { if (!isdigit((unsigned char)*s)) { if (!seen_decimal_pt && strncmp(s, decimal_point, decimal_pt_len) == 0) { s += decimal_pt_len; seen_decimal_pt = 1; continue; } if (ISEXP((unsigned char)*s)) { s++; if (ISSIGN((unsigned char)*s) || isdigit((unsigned char)*s)) { s++; continue; } } break; } s++; } return *s == '\0'; } /* * valid_format - validate user specified format string */ static int valid_format(const char *fmt) { unsigned conversions = 0; while (*fmt != '\0') { /* scan for conversions */ if (*fmt != '%') { fmt++; continue; } fmt++; /* allow %% but not things like %10% */ if (*fmt == '%') { fmt++; continue; } /* flags */ while (*fmt != '\0' && strchr("#0- +'", *fmt)) { fmt++; } /* field width */ while (*fmt != '\0' && strchr("0123456789", *fmt)) { fmt++; } /* precision */ if (*fmt == '.') { fmt++; while (*fmt != '\0' && strchr("0123456789", *fmt)) { fmt++; } } /* conversion */ switch (*fmt) { case 'A': case 'a': case 'E': case 'e': case 'F': case 'f': case 'G': case 'g': /* floating point formats are accepted */ conversions++; break; default: /* anything else is not */ return 0; } } /* PR 236347 -- user format strings must have a conversion */ return conversions == 1; } /* * e_atof - convert an ASCII string to a double * exit if string is not a valid double, or if converted value would * cause overflow or underflow */ static double e_atof(const char *num) { char *endp; double dbl; errno = 0; dbl = strtod(num, &endp); if (errno == ERANGE) /* under or overflow */ err(2, "%s", num); else if (*endp != '\0') /* "junk" left in number */ errx(2, "invalid floating point argument: %s", num); /* zero shall have no sign */ if (dbl == -0.0) dbl = 0; return dbl; } /* * decimal_places - count decimal places in a number (string) */ static int decimal_places(const char *number) { int places = 0; char *dp; /* look for a decimal point */ if ((dp = strstr(number, decimal_point))) { dp += strlen(decimal_point); while (isdigit((unsigned char)*dp++)) places++; } return places; } /* * generate_format - create a format string * * XXX to be bug for bug compatible with Plan9 and GNU return "%g" * when "%g" prints as "%e" (this way no width adjustments are made) */ static char * generate_format(double first, double incr, double last, int equalize, char pad) { static char buf[256]; char cc = '\0'; int precision, width1, width2, places; if (equalize == 0) return default_format; /* figure out "last" value printed */ if (first > last) last = first - incr * floor((first - last) / incr); else last = first + incr * floor((last - first) / incr); snprintf(buf, sizeof(buf), "%g", incr); if (strchr(buf, 'e')) cc = 'e'; precision = decimal_places(buf); width1 = snprintf(buf, sizeof(buf), "%g", first); if (strchr(buf, 'e')) cc = 'e'; if ((places = decimal_places(buf))) width1 -= (places + strlen(decimal_point)); precision = MAXIMUM(places, precision); width2 = snprintf(buf, sizeof(buf), "%g", last); if (strchr(buf, 'e')) cc = 'e'; if ((places = decimal_places(buf))) width2 -= (places + strlen(decimal_point)); /* XXX if incr is floating point fix the precision */ if (precision) { snprintf(buf, sizeof(buf), "%%%c%d.%d%c", pad, MAXIMUM(width1, width2) + (int)strlen(decimal_point) + precision, precision, (cc) ? cc : 'f'); } else { snprintf(buf, sizeof(buf), "%%%c%d%c", pad, MAXIMUM(width1, width2), (cc) ? cc : 'g'); } return buf; } static __dead void usage(int error) { fprintf(stderr, "usage: %s [-w] [-f format] [-s string] [first [incr]] last\n", getprogname()); exit(error); }