1/* A more useful interface to strtol. 2 3 Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2003, 2004, 2005 4 Free Software Foundation, Inc. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software Foundation, 18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ 19 20/* Written by Jim Meyering. */ 21 22#ifdef HAVE_CONFIG_H 23# include <config.h> 24#endif 25 26#include "xstrtol.h" 27 28#ifndef __strtol 29# define __strtol strtol 30# define __strtol_t long int 31# define __xstrtol xstrtol 32# define STRTOL_T_MINIMUM LONG_MIN 33# define STRTOL_T_MAXIMUM LONG_MAX 34#endif 35 36/* Some pre-ANSI implementations (e.g. SunOS 4) 37 need stderr defined if assertion checking is enabled. */ 38#include <stdio.h> 39 40#include <assert.h> 41#include <ctype.h> 42#include <errno.h> 43#include <limits.h> 44#include <stdlib.h> 45#include <string.h> 46 47#include "intprops.h" 48 49#ifndef STRTOL_T_MINIMUM 50# define STRTOL_T_MINIMUM TYPE_MINIMUM (__strtol_t) 51# define STRTOL_T_MAXIMUM TYPE_MAXIMUM (__strtol_t) 52#endif 53 54#if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII)) 55# define IN_CTYPE_DOMAIN(c) 1 56#else 57# define IN_CTYPE_DOMAIN(c) isascii(c) 58#endif 59 60#define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c)) 61 62#if !HAVE_DECL_STRTOIMAX && !defined strtoimax 63intmax_t strtoimax (); 64#endif 65 66#if !HAVE_DECL_STRTOUMAX && !defined strtoumax 67uintmax_t strtoumax (); 68#endif 69 70static strtol_error 71bkm_scale (__strtol_t *x, int scale_factor) 72{ 73 if (TYPE_SIGNED (__strtol_t) && *x < STRTOL_T_MINIMUM / scale_factor) 74 { 75 *x = STRTOL_T_MINIMUM; 76 return LONGINT_OVERFLOW; 77 } 78 if (STRTOL_T_MAXIMUM / scale_factor < *x) 79 { 80 *x = STRTOL_T_MAXIMUM; 81 return LONGINT_OVERFLOW; 82 } 83 *x *= scale_factor; 84 return LONGINT_OK; 85} 86 87static strtol_error 88bkm_scale_by_power (__strtol_t *x, int base, int power) 89{ 90 strtol_error err = LONGINT_OK; 91 while (power--) 92 err |= bkm_scale (x, base); 93 return err; 94} 95 96/* FIXME: comment. */ 97 98strtol_error 99__xstrtol (const char *s, char **ptr, int strtol_base, 100 __strtol_t *val, const char *valid_suffixes) 101{ 102 char *t_ptr; 103 char **p; 104 __strtol_t tmp; 105 strtol_error err = LONGINT_OK; 106 107 assert (0 <= strtol_base && strtol_base <= 36); 108 109 p = (ptr ? ptr : &t_ptr); 110 111 if (! TYPE_SIGNED (__strtol_t)) 112 { 113 const char *q = s; 114 unsigned char ch = *q; 115 while (ISSPACE (ch)) 116 ch = *++q; 117 if (ch == '-') 118 return LONGINT_INVALID; 119 } 120 121 errno = 0; 122 tmp = __strtol (s, p, strtol_base); 123 124 if (*p == s) 125 { 126 /* If there is no number but there is a valid suffix, assume the 127 number is 1. The string is invalid otherwise. */ 128 if (valid_suffixes && **p && strchr (valid_suffixes, **p)) 129 tmp = 1; 130 else 131 return LONGINT_INVALID; 132 } 133 else if (errno != 0) 134 { 135 if (errno != ERANGE) 136 return LONGINT_INVALID; 137 err = LONGINT_OVERFLOW; 138 } 139 140 /* Let valid_suffixes == NULL mean `allow any suffix'. */ 141 /* FIXME: update all callers except the ones that allow suffixes 142 after the number, changing last parameter NULL to `""'. */ 143 if (!valid_suffixes) 144 { 145 *val = tmp; 146 return err; 147 } 148 149 if (**p != '\0') 150 { 151 int base = 1024; 152 int suffixes = 1; 153 strtol_error overflow; 154 155 if (!strchr (valid_suffixes, **p)) 156 { 157 *val = tmp; 158 return err | LONGINT_INVALID_SUFFIX_CHAR; 159 } 160 161 if (strchr (valid_suffixes, '0')) 162 { 163 /* The ``valid suffix'' '0' is a special flag meaning that 164 an optional second suffix is allowed, which can change 165 the base. A suffix "B" (e.g. "100MB") stands for a power 166 of 1000, whereas a suffix "iB" (e.g. "100MiB") stands for 167 a power of 1024. If no suffix (e.g. "100M"), assume 168 power-of-1024. */ 169 170 switch (p[0][1]) 171 { 172 case 'i': 173 if (p[0][2] == 'B') 174 suffixes += 2; 175 break; 176 177 case 'B': 178 case 'D': /* 'D' is obsolescent */ 179 base = 1000; 180 suffixes++; 181 break; 182 } 183 } 184 185 switch (**p) 186 { 187 case 'b': 188 overflow = bkm_scale (&tmp, 512); 189 break; 190 191 case 'B': 192 overflow = bkm_scale (&tmp, 1024); 193 break; 194 195 case 'c': 196 overflow = 0; 197 break; 198 199 case 'E': /* exa or exbi */ 200 overflow = bkm_scale_by_power (&tmp, base, 6); 201 break; 202 203 case 'G': /* giga or gibi */ 204 case 'g': /* 'g' is undocumented; for compatibility only */ 205 overflow = bkm_scale_by_power (&tmp, base, 3); 206 break; 207 208 case 'k': /* kilo */ 209 case 'K': /* kibi */ 210 overflow = bkm_scale_by_power (&tmp, base, 1); 211 break; 212 213 case 'M': /* mega or mebi */ 214 case 'm': /* 'm' is undocumented; for compatibility only */ 215 overflow = bkm_scale_by_power (&tmp, base, 2); 216 break; 217 218 case 'P': /* peta or pebi */ 219 overflow = bkm_scale_by_power (&tmp, base, 5); 220 break; 221 222 case 'T': /* tera or tebi */ 223 case 't': /* 't' is undocumented; for compatibility only */ 224 overflow = bkm_scale_by_power (&tmp, base, 4); 225 break; 226 227 case 'w': 228 overflow = bkm_scale (&tmp, 2); 229 break; 230 231 case 'Y': /* yotta or 2**80 */ 232 overflow = bkm_scale_by_power (&tmp, base, 8); 233 break; 234 235 case 'Z': /* zetta or 2**70 */ 236 overflow = bkm_scale_by_power (&tmp, base, 7); 237 break; 238 239 default: 240 *val = tmp; 241 return err | LONGINT_INVALID_SUFFIX_CHAR; 242 } 243 244 err |= overflow; 245 *p += suffixes; 246 if (**p) 247 err |= LONGINT_INVALID_SUFFIX_CHAR; 248 } 249 250 *val = tmp; 251 return err; 252} 253 254#ifdef TESTING_XSTRTO 255 256# include <stdio.h> 257# include "error.h" 258 259char *program_name; 260 261int 262main (int argc, char **argv) 263{ 264 strtol_error s_err; 265 int i; 266 267 program_name = argv[0]; 268 for (i=1; i<argc; i++) 269 { 270 char *p; 271 __strtol_t val; 272 273 s_err = __xstrtol (argv[i], &p, 0, &val, "bckmw"); 274 if (s_err == LONGINT_OK) 275 { 276 printf ("%s->%lu (%s)\n", argv[i], val, p); 277 } 278 else 279 { 280 STRTOL_FATAL_ERROR (argv[i], "arg", s_err); 281 } 282 } 283 exit (0); 284} 285 286#endif /* TESTING_XSTRTO */ 287