strlen.c (1016B)
1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* This Source Code Form is subject to the terms of the Mozilla Public 3 * License, v. 2.0. If a copy of the MPL was not distributed with this 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 5 6 #include "plstr.h" 7 #include "prtypes.h" 8 #include "prlog.h" 9 #include <string.h> 10 11 PR_IMPLEMENT(PRUint32) 12 PL_strlen(const char* str) { 13 size_t l; 14 15 if ((const char*)0 == str) { 16 return 0; 17 } 18 19 l = strlen(str); 20 21 /* error checking in case we have a 64-bit platform -- make sure 22 * we don't have ultra long strings that overflow an int32 23 */ 24 if (sizeof(PRUint32) < sizeof(size_t)) { 25 if (l > PR_INT32_MAX) { 26 PR_Assert("l <= PR_INT32_MAX", __FILE__, __LINE__); 27 } 28 } 29 30 return (PRUint32)l; 31 } 32 33 PR_IMPLEMENT(PRUint32) 34 PL_strnlen(const char* str, PRUint32 max) { 35 register const char* s; 36 37 if ((const char*)0 == str) { 38 return 0; 39 } 40 for (s = str; max && *s; s++, max--); 41 42 return (PRUint32)(s - str); 43 }