Annotation of src/usr.bin/seq/seq.c, Revision 1.1
1.1 ! millert 1: /* $OpenBSD$ */
! 2:
! 3: /*-
! 4: * Copyright (c) 2005 The NetBSD Foundation, Inc.
! 5: * All rights reserved.
! 6: *
! 7: * This code is derived from software contributed to The NetBSD Foundation
! 8: * by Brian Ginsbach.
! 9: *
! 10: * Redistribution and use in source and binary forms, with or without
! 11: * modification, are permitted provided that the following conditions
! 12: * are met:
! 13: * 1. Redistributions of source code must retain the above copyright
! 14: * notice, this list of conditions and the following disclaimer.
! 15: * 2. Redistributions in binary form must reproduce the above copyright
! 16: * notice, this list of conditions and the following disclaimer in the
! 17: * documentation and/or other materials provided with the distribution.
! 18: *
! 19: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
! 20: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! 21: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
! 22: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
! 23: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
! 24: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
! 25: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
! 26: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
! 27: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
! 28: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! 29: * POSSIBILITY OF SUCH DAMAGE.
! 30: */
! 31:
! 32: #include <ctype.h>
! 33: #include <err.h>
! 34: #include <errno.h>
! 35: #include <getopt.h>
! 36: #include <math.h>
! 37: #include <locale.h>
! 38: #include <stdio.h>
! 39: #include <stdlib.h>
! 40: #include <string.h>
! 41: #include <unistd.h>
! 42:
! 43: #define VERSION "1.0"
! 44: #define ZERO '0'
! 45: #define SPACE ' '
! 46:
! 47: #define MAXIMUM(a, b) (((a) < (b))? (b) : (a))
! 48: #define ISSIGN(c) ((int)(c) == '-' || (int)(c) == '+')
! 49: #define ISEXP(c) ((int)(c) == 'e' || (int)(c) == 'E')
! 50: #define ISODIGIT(c) ((int)(c) >= '0' && (int)(c) <= '7')
! 51:
! 52: /* Globals */
! 53:
! 54: static const char *decimal_point = "."; /* default */
! 55: static char default_format[] = { "%g" }; /* default */
! 56:
! 57: static const struct option long_opts[] =
! 58: {
! 59: {"format", required_argument, NULL, 'f'},
! 60: {"help", no_argument, NULL, 'h'},
! 61: {"separator", required_argument, NULL, 's'},
! 62: {"version", no_argument, NULL, 'v'},
! 63: {"equal-width", no_argument, NULL, 'w'},
! 64: {NULL, no_argument, NULL, 0}
! 65: };
! 66:
! 67: /* Prototypes */
! 68:
! 69: static double e_atof(const char *);
! 70:
! 71: static int decimal_places(const char *);
! 72: static int numeric(const char *);
! 73: static int valid_format(const char *);
! 74:
! 75: static char *generate_format(double, double, double, int, char);
! 76:
! 77: static __dead void usage(int error);
! 78:
! 79: /*
! 80: * The seq command will print out a numeric sequence from 1, the default,
! 81: * to a user specified upper limit by 1. The lower bound and increment
! 82: * maybe indicated by the user on the command line. The sequence can
! 83: * be either whole, the default, or decimal numbers.
! 84: */
! 85: int
! 86: main(int argc, char *argv[])
! 87: {
! 88: int c = 0;
! 89: int equalize = 0;
! 90: double first = 1.0;
! 91: double last = 0.0;
! 92: double incr = 0.0;
! 93: double last_shown_value = 0.0;
! 94: double cur, step;
! 95: struct lconv *locale;
! 96: char *fmt = NULL;
! 97: const char *sep = "\n";
! 98: const char *term = "\n";
! 99: char *cur_print, *last_print;
! 100: char pad = ZERO;
! 101:
! 102: /* Determine the locale's decimal point. */
! 103: locale = localeconv();
! 104: if (locale && locale->decimal_point && locale->decimal_point[0] != '\0')
! 105: decimal_point = locale->decimal_point;
! 106:
! 107: /*
! 108: * Process options, but handle negative numbers separately
! 109: * least they trip up getopt(3).
! 110: */
! 111: while ((optind < argc) && !numeric(argv[optind]) &&
! 112: (c = getopt_long(argc, argv, "+f:s:w", long_opts, NULL)) != -1) {
! 113:
! 114: switch (c) {
! 115: case 'f': /* format (plan9/GNU) */
! 116: fmt = optarg;
! 117: equalize = 0;
! 118: break;
! 119: case 's': /* separator (GNU) */
! 120: sep = optarg;
! 121: break;
! 122: case 'v': /* version (GNU) */
! 123: printf("seq version %s\n", VERSION);
! 124: return 0;
! 125: case 'w': /* equal width (plan9/GNU) */
! 126: if (fmt == NULL) {
! 127: if (equalize++)
! 128: pad = SPACE;
! 129: }
! 130: break;
! 131: case 'h': /* help (GNU) */
! 132: usage(0);
! 133: break;
! 134: default:
! 135: usage(1);
! 136: break;
! 137: }
! 138: }
! 139:
! 140: argc -= optind;
! 141: argv += optind;
! 142: if (argc < 1 || argc > 3)
! 143: usage(1);
! 144:
! 145: last = e_atof(argv[argc - 1]);
! 146:
! 147: if (argc > 1)
! 148: first = e_atof(argv[0]);
! 149:
! 150: if (argc > 2) {
! 151: incr = e_atof(argv[1]);
! 152: /* Plan 9/GNU don't do zero */
! 153: if (incr == 0.0)
! 154: errx(1, "zero %screment", (first < last)? "in" : "de");
! 155: }
! 156:
! 157: /* default is one for Plan 9/GNU work alike */
! 158: if (incr == 0.0)
! 159: incr = (first < last) ? 1.0 : -1.0;
! 160:
! 161: if (incr <= 0.0 && first < last)
! 162: errx(1, "needs positive increment");
! 163:
! 164: if (incr >= 0.0 && first > last)
! 165: errx(1, "needs negative decrement");
! 166:
! 167: if (fmt != NULL) {
! 168: if (!valid_format(fmt))
! 169: errx(1, "invalid format string: `%s'", fmt);
! 170: /*
! 171: * XXX to be bug for bug compatible with Plan 9 add a
! 172: * newline if none found at the end of the format string.
! 173: */
! 174: } else
! 175: fmt = generate_format(first, incr, last, equalize, pad);
! 176:
! 177: for (step = 1, cur = first; incr > 0 ? cur <= last : cur >= last;
! 178: cur = first + incr * step++) {
! 179: if (cur != first)
! 180: fputs(sep, stdout);
! 181: printf(fmt, cur);
! 182: last_shown_value = cur;
! 183: }
! 184:
! 185: /*
! 186: * Did we miss the last value of the range in the loop above?
! 187: *
! 188: * We might have, so check if the printable version of the last
! 189: * computed value ('cur') and desired 'last' value are equal. If they
! 190: * are equal after formatting truncation, but 'cur' and
! 191: * 'last_shown_value' are not equal, it means the exit condition of the
! 192: * loop held true due to a rounding error and we still need to print
! 193: * 'last'.
! 194: */
! 195: asprintf(&cur_print, fmt, cur);
! 196: asprintf(&last_print, fmt, last);
! 197: if (strcmp(cur_print, last_print) == 0 && cur != last_shown_value) {
! 198: if (cur != first)
! 199: fputs(sep, stdout);
! 200: fputs(last_print, stdout);
! 201: }
! 202: free(cur_print);
! 203: free(last_print);
! 204:
! 205: fputs(term, stdout);
! 206:
! 207: return 0;
! 208: }
! 209:
! 210: /*
! 211: * numeric - verify that string is numeric
! 212: */
! 213: static int
! 214: numeric(const char *s)
! 215: {
! 216: int seen_decimal_pt, decimal_pt_len;
! 217:
! 218: /* skip any sign */
! 219: if (ISSIGN((unsigned char)*s))
! 220: s++;
! 221:
! 222: seen_decimal_pt = 0;
! 223: decimal_pt_len = strlen(decimal_point);
! 224: while (*s) {
! 225: if (!isdigit((unsigned char)*s)) {
! 226: if (!seen_decimal_pt &&
! 227: strncmp(s, decimal_point, decimal_pt_len) == 0) {
! 228: s += decimal_pt_len;
! 229: seen_decimal_pt = 1;
! 230: continue;
! 231: }
! 232: if (ISEXP((unsigned char)*s)) {
! 233: s++;
! 234: if (ISSIGN((unsigned char)*s) ||
! 235: isdigit((unsigned char)*s)) {
! 236: s++;
! 237: continue;
! 238: }
! 239: }
! 240: break;
! 241: }
! 242: s++;
! 243: }
! 244: return *s == '\0';
! 245: }
! 246:
! 247: /*
! 248: * valid_format - validate user specified format string
! 249: */
! 250: static int
! 251: valid_format(const char *fmt)
! 252: {
! 253: unsigned conversions = 0;
! 254:
! 255: while (*fmt != '\0') {
! 256: /* scan for conversions */
! 257: if (*fmt != '%') {
! 258: fmt++;
! 259: continue;
! 260: }
! 261: fmt++;
! 262:
! 263: /* allow %% but not things like %10% */
! 264: if (*fmt == '%') {
! 265: fmt++;
! 266: continue;
! 267: }
! 268:
! 269: /* flags */
! 270: while (*fmt != '\0' && strchr("#0- +'", *fmt)) {
! 271: fmt++;
! 272: }
! 273:
! 274: /* field width */
! 275: while (*fmt != '\0' && strchr("0123456789", *fmt)) {
! 276: fmt++;
! 277: }
! 278:
! 279: /* precision */
! 280: if (*fmt == '.') {
! 281: fmt++;
! 282: while (*fmt != '\0' && strchr("0123456789", *fmt)) {
! 283: fmt++;
! 284: }
! 285: }
! 286:
! 287: /* conversion */
! 288: switch (*fmt) {
! 289: case 'A':
! 290: case 'a':
! 291: case 'E':
! 292: case 'e':
! 293: case 'F':
! 294: case 'f':
! 295: case 'G':
! 296: case 'g':
! 297: /* floating point formats are accepted */
! 298: conversions++;
! 299: break;
! 300: default:
! 301: /* anything else is not */
! 302: return 0;
! 303: }
! 304: }
! 305:
! 306: /* PR 236347 -- user format strings must have a conversion */
! 307: return conversions == 1;
! 308: }
! 309:
! 310: /*
! 311: * e_atof - convert an ASCII string to a double
! 312: * exit if string is not a valid double, or if converted value would
! 313: * cause overflow or underflow
! 314: */
! 315: static double
! 316: e_atof(const char *num)
! 317: {
! 318: char *endp;
! 319: double dbl;
! 320:
! 321: errno = 0;
! 322: dbl = strtod(num, &endp);
! 323:
! 324: if (errno == ERANGE)
! 325: /* under or overflow */
! 326: err(2, "%s", num);
! 327: else if (*endp != '\0')
! 328: /* "junk" left in number */
! 329: errx(2, "invalid floating point argument: %s", num);
! 330:
! 331: /* zero shall have no sign */
! 332: if (dbl == -0.0)
! 333: dbl = 0;
! 334: return dbl;
! 335: }
! 336:
! 337: /*
! 338: * decimal_places - count decimal places in a number (string)
! 339: */
! 340: static int
! 341: decimal_places(const char *number)
! 342: {
! 343: int places = 0;
! 344: char *dp;
! 345:
! 346: /* look for a decimal point */
! 347: if ((dp = strstr(number, decimal_point))) {
! 348: dp += strlen(decimal_point);
! 349:
! 350: while (isdigit((unsigned char)*dp++))
! 351: places++;
! 352: }
! 353: return places;
! 354: }
! 355:
! 356: /*
! 357: * generate_format - create a format string
! 358: *
! 359: * XXX to be bug for bug compatible with Plan9 and GNU return "%g"
! 360: * when "%g" prints as "%e" (this way no width adjustments are made)
! 361: */
! 362: static char *
! 363: generate_format(double first, double incr, double last, int equalize, char pad)
! 364: {
! 365: static char buf[256];
! 366: char cc = '\0';
! 367: int precision, width1, width2, places;
! 368:
! 369: if (equalize == 0)
! 370: return default_format;
! 371:
! 372: /* figure out "last" value printed */
! 373: if (first > last)
! 374: last = first - incr * floor((first - last) / incr);
! 375: else
! 376: last = first + incr * floor((last - first) / incr);
! 377:
! 378: snprintf(buf, sizeof(buf), "%g", incr);
! 379: if (strchr(buf, 'e'))
! 380: cc = 'e';
! 381: precision = decimal_places(buf);
! 382:
! 383: width1 = snprintf(buf, sizeof(buf), "%g", first);
! 384: if (strchr(buf, 'e'))
! 385: cc = 'e';
! 386: if ((places = decimal_places(buf)))
! 387: width1 -= (places + strlen(decimal_point));
! 388:
! 389: precision = MAXIMUM(places, precision);
! 390:
! 391: width2 = snprintf(buf, sizeof(buf), "%g", last);
! 392: if (strchr(buf, 'e'))
! 393: cc = 'e';
! 394: if ((places = decimal_places(buf)))
! 395: width2 -= (places + strlen(decimal_point));
! 396:
! 397: /* XXX if incr is floating point fix the precision */
! 398: if (precision) {
! 399: snprintf(buf, sizeof(buf), "%%%c%d.%d%c", pad,
! 400: MAXIMUM(width1, width2) + (int) strlen(decimal_point) +
! 401: precision, precision, (cc) ? cc : 'f');
! 402: } else {
! 403: snprintf(buf, sizeof(buf), "%%%c%d%c", pad,
! 404: MAXIMUM(width1, width2), (cc) ? cc : 'g');
! 405: }
! 406:
! 407: return buf;
! 408: }
! 409:
! 410: static __dead void
! 411: usage(int error)
! 412: {
! 413: fprintf(stderr,
! 414: "usage: %s [-vw] [-f format] [-s string] [first [incr]] last\n",
! 415: getprogname());
! 416: exit(error);
! 417: }
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