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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: factorial.c,v 1.3 2002/01/13 19:51:59 mdw Exp $ |
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4 | * |
5 | * Example factorial computation |
6 | * |
7 | * (c) 2000 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Catacomb. |
13 | * |
14 | * Catacomb is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
18 | * |
19 | * Catacomb is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU Library General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with Catacomb; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: factorial.c,v $ |
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33 | * Revision 1.3 2002/01/13 19:51:59 mdw |
34 | * Provide proper help and options parsing. Allow more bases. Use |
35 | * @mptext@ to read integers for the better base support. |
36 | * |
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37 | * Revision 1.2 2001/06/16 13:22:59 mdw |
38 | * Added command-line option to select output radix. |
39 | * |
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40 | * Revision 1.1 2000/07/09 21:30:49 mdw |
41 | * Demo program to compute factorials. |
42 | * |
43 | */ |
44 | |
45 | /*----- Header files ------------------------------------------------------*/ |
46 | |
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47 | #include "config.h" |
48 | |
49 | #include <ctype.h> |
50 | #include <limits.h> |
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51 | #include <stdio.h> |
52 | #include <stdlib.h> |
53 | |
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54 | #include <mLib/mdwopt.h> |
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55 | #include <mLib/quis.h> |
56 | #include <mLib/report.h> |
57 | |
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58 | #include "mpint.h" |
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59 | #include "mpmul.h" |
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60 | #include "mptext.h" |
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61 | |
62 | /*----- Main code ---------------------------------------------------------*/ |
63 | |
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64 | static void usage(FILE *fp) |
65 | { |
66 | pquis(fp, "Usage: $ [-r radix] integer\n"); |
67 | } |
68 | |
69 | static void version(FILE *fp) |
70 | { |
71 | pquis(fp, "$, Catacomb version " VERSION "\n"); |
72 | } |
73 | |
74 | static void help(FILE *fp) |
75 | { |
76 | version(fp); |
77 | putc('\n', fp); |
78 | usage(fp); |
79 | fputs("\n\ |
80 | Prints the factorial of the given integer on its output. Input may be\n\ |
81 | in decimal (the default), octal with preceding zero, hex with preceding\n\ |
82 | `0x', or any base N between 2 and 62 inclusive with preceding `N_'.\n\ |
83 | Output may be in any base between 2 and 62; the default is base 10. For\n\ |
84 | bases between 11 and 36 inclusive, lowercase letters of either case are\n\ |
85 | used as additional digits with values 10 upwards; lowercase is always\n\ |
86 | used for output. For bases between 37 and 62 inclusive, lowercase letters\n\ |
87 | have lower value than uppercase; hence `a' has the value 10, while `A' has\n\ |
88 | the value 36.\n\ |
89 | \n\ |
90 | Options provided:\n\ |
91 | \n\ |
92 | -h, --help Display this help message.\n\ |
93 | -v, --version Display the version number.\n\ |
94 | -u, --usage Display a usage message.\n\ |
95 | \n\ |
96 | -r, --radix=N Write output in base N.\n\ |
97 | ", fp); |
98 | } |
99 | |
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100 | int main(int argc, char *argv[]) |
101 | { |
102 | unsigned long x; |
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103 | int r = 10; |
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104 | char *p; |
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105 | mp *f, *ulmax, *xx; |
106 | unsigned fl = 0; |
107 | |
108 | #define f_bogus 1u |
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109 | |
110 | ego(argv[0]); |
111 | |
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112 | for (;;) { |
113 | static const struct option opt[] = { |
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114 | { "help", 0, 0, 'h' }, |
115 | { "version", 0, 0, 'v' }, |
116 | { "usage", 0, 0, 'u' }, |
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117 | { "radix", OPTF_ARGREQ, 0, 'r' }, |
118 | { 0, 0, 0, 0 } |
119 | }; |
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120 | int i = mdwopt(argc, argv, "hvur:", opt, 0, 0, 0); |
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121 | if (i < 0) |
122 | break; |
123 | switch (i) { |
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124 | case 'h': |
125 | help(stdout); |
126 | exit(0); |
127 | case 'v': |
128 | version(stdout); |
129 | exit(0); |
130 | case 'u': |
131 | usage(stdout); |
132 | exit(0); |
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133 | case 'r': |
134 | r = atoi(optarg); |
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135 | if (r < 2 || r > 62) |
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136 | die(EXIT_FAILURE, "bad radix `%s'", optarg); |
137 | break; |
138 | default: |
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139 | fl |= f_bogus; |
140 | break; |
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141 | } |
142 | } |
143 | |
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144 | if (optind + 1 != argc || (fl & f_bogus)) { |
145 | usage(stderr); |
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146 | exit(EXIT_FAILURE); |
147 | } |
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148 | ulmax = mp_fromulong(MP_NEW, ULONG_MAX); |
149 | p = argv[optind]; |
150 | while (isspace((unsigned char)*p)) |
151 | p++; |
152 | xx = mp_readstring(MP_NEW, argv[optind], &p, 0); |
153 | while (isspace((unsigned char)*p)) |
154 | p++; |
155 | if (!xx || *p || MP_CMP(xx, >, ulmax)) |
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156 | die(EXIT_FAILURE, "bad integer `%s'", argv[optind]); |
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157 | x = mp_toulong(xx); |
158 | mp_drop(xx); |
159 | mp_drop(ulmax); |
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160 | f = mp_factorial(x); |
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161 | mp_writefile(f, stdout, r); |
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162 | fputc('\n', stdout); |
163 | mp_drop(f); |
164 | return (0); |
165 | } |
166 | |
167 | /*----- That's all, folks -------------------------------------------------*/ |