/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms * are also available at http://curl.haxx.se/docs/copyright.html. * * You may opt to use, copy, modify, merge, publish, distribute and/or sell * copies of the Software, and permit persons to whom the Software is * furnished to do so, under the terms of the COPYING file. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ***************************************************************************/ #include "curl_setup.h" #include "strtoofft.h" /* * NOTE: * * In the ISO C standard (IEEE Std 1003.1), there is a strtoimax() function we * could use in case strtoll() doesn't exist... See * http://www.opengroup.org/onlinepubs/009695399/functions/strtoimax.html */ #ifdef NEED_CURL_STRTOLL /* Range tests can be used for alphanum decoding if characters are consecutive, like in ASCII. Else an array is scanned. Determine this condition now. */ #if('9' - '0') != 9 || ('Z' - 'A') != 25 || ('z' - 'a') != 25 #define NO_RANGE_TEST static const char valchars[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; #endif static int get_char(char c, int base); /** * Emulated version of the strtoll function. This extracts a long long * value from the given input string and returns it. */ curl_off_t curlx_strtoll(const char *nptr, char **endptr, int base) { char *end; int is_negative = 0; int overflow; int i; curl_off_t value = 0; curl_off_t newval; /* Skip leading whitespace. */ end = (char *)nptr; while(ISSPACE(end[0])) { end++; } /* Handle the sign, if any. */ if(end[0] == '-') { is_negative = 1; end++; } else if(end[0] == '+') { end++; } else if(end[0] == '\0') { /* We had nothing but perhaps some whitespace -- there was no number. */ if(endptr) { *endptr = end; } return 0; } /* Handle special beginnings, if present and allowed. */ if(end[0] == '0' && end[1] == 'x') { if(base == 16 || base == 0) { end += 2; base = 16; } } else if(end[0] == '0') { if(base == 8 || base == 0) { end++; base = 8; } } /* Matching strtol, if the base is 0 and it doesn't look like * the number is octal or hex, we assume it's base 10. */ if(base == 0) { base = 10; } /* Loop handling digits. */ value = 0; overflow = 0; for(i = get_char(end[0], base); i != -1; end++, i = get_char(end[0], base)) { newval = base * value + i; if(newval < value) { /* We've overflowed. */ overflow = 1; break; } else value = newval; } if(!overflow) { if(is_negative) { /* Fix the sign. */ value *= -1; } } else { if(is_negative) value = CURL_OFF_T_MIN; else value = CURL_OFF_T_MAX; SET_ERRNO(ERANGE); } if(endptr) *endptr = end; return value; } /** * Returns the value of c in the given base, or -1 if c cannot * be interpreted properly in that base (i.e., is out of range, * is a null, etc.). * * @param c the character to interpret according to base * @param base the base in which to interpret c * * @return the value of c in base, or -1 if c isn't in range */ static int get_char(char c, int base) { #ifndef NO_RANGE_TEST int value = -1; if(c <= '9' && c >= '0') { value = c - '0'; } else if(c <= 'Z' && c >= 'A') { value = c - 'A' + 10; } else if(c <= 'z' && c >= 'a') { value = c - 'a' + 10; } #else const char * cp; int value; cp = memchr(valchars, c, 10 + 26 + 26); if(!cp) return -1; value = cp - valchars; if(value >= 10 + 26) value -= 26; /* Lowercase. */ #endif if(value >= base) { value = -1; } return value; } #endif /* Only present if we need strtoll, but don't have it. */