/** * slibc — Yet another C library * Copyright © 2015 Mattias Andrée (maandree@member.fsf.org) * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include #include #include #include /** * Compare two memory segments alphabetically in a case sensitive manner. * * @param a A negetive value is returned if this is the lesser. * @param b A positive value is returned if this is the lesser. * @param size The size of the segments. * @return Zero is returned if `a` and `b` are equal, otherwise, * see the specifications for `a` and `b`. */ int memcmp(const void* a, const void* b, size_t size) { const signed char* s1 = a; const signed char* s2 = b; while (size--) if (*s1 == *s2) s1++, s2++; else return (int)(*s1 - *s2); return 0; } /** * Compare two strings alphabetically in a case sensitive manner. * * @param a A negetive value is returned if this is the lesser. * @param b A positive value is returned if this is the lesser. * @return Zero is returned if `a` and `b` are equal, otherwise, * see the specifications for `a` and `b`. */ int strcmp(const char* a, const char* b) { size_t n = strlen(a); size_t m = strlen(b); return memcmp(a, b, (n < m ? n : m) + 1); } /** * Compare two strings alphabetically in a case insensitive manner. * Be aware, only ASCII characters are case insensitive, non-ASCII * characters are case sensitive. * * @param a A negetive value is returned if this is the lesser. * @param b A positive value is returned if this is the lesser. * @return Zero is returned if `a` and `b` are equal, otherwise, * see the specifications for `a` and `b`. */ int strcasecmp(const char* a, const char* b) { return strncasecmp(a, b, SIZE_MAX); } /** * Compare two strings alphabetically in a case sensitive manner. * * @param a A negetive value is returned if this is the lesser. * @param b A positive value is returned if this is the lesser. * @param length The maximum number of characters to compare. * @return Zero is returned if `a` and `b` are equal, otherwise, * see the specifications for `a` and `b`. */ int strncmp(const char* a, const char* b, size_t length) { size_t n = strnlen(a, length); size_t m = strnlen(b, length); int r = memcmp(a, b, (n < m ? n : m)); return r ? r : n == m ? 0 : n < m ? -1 : +1; } /** * Compare two strings alphabetically in a case insensitive manner. * Be aware, only ASCII characters are case insensitive, non-ASCII * characters are case sensitive. * * @param a A negetive value is returned if this is the lesser. * @param b A positive value is returned if this is the lesser. * @param length The maximum number of characters to compare. * @return Zero is returned if `a` and `b` are equal, otherwise, * see the specifications for `a` and `b`. */ int strncasecmp(const char* a, const char* b, size_t length) { int c1, c2; for (; size--; a++, b++) if (*a != *b) { c1 = isalpha(*a) ? tolower(*a) : (int)*a; c2 = isalpha(*b) ? tolower(*b) : (int)*b; if ((c1 -= c2)) return c1; } return 0; }