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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [argz/] [argz_replace.c] - Rev 207
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/* Copyright (C) 2002 by Red Hat, Incorporated. All rights reserved. * * Permission to use, copy, modify, and distribute this software * is freely granted, provided that this notice is preserved. */ #include <errno.h> #include <sys/types.h> #include <string.h> #include <stdlib.h> #include <argz.h> #include "buf_findstr.h" error_t _DEFUN (argz_replace, (argz, argz_len, str, with, replace_count), char **argz _AND size_t *argz_len _AND const char *str _AND const char *with _AND unsigned *replace_count) { const int str_len = strlen(str); const int with_len = strlen(with); const int len_diff = with_len - str_len; char *buf_iter = *argz; size_t buf_len = *argz_len; char *last_iter = NULL; char *new_argz = NULL; size_t new_argz_len = 0; char *new_argz_iter = NULL; *replace_count = 0; new_argz_len = *argz_len; while(buf_len) { if(_buf_findstr(str, &buf_iter, &buf_len)) { *replace_count += 1; new_argz_len += len_diff; } } if (*replace_count) { new_argz = (char *)malloc(new_argz_len); buf_iter = *argz; buf_len = *argz_len; last_iter = buf_iter; new_argz_iter = new_argz; while(buf_len) { if (_buf_findstr(str, &buf_iter, &buf_len)) { /* copy everything up to, but not including str, from old argz to new argz. */ memcpy(new_argz_iter, last_iter, buf_iter - last_iter - str_len); new_argz_iter += (buf_iter - last_iter - str_len); /* copy replacement string. */ memcpy(new_argz_iter, with, with_len); new_argz_iter += with_len; last_iter = buf_iter; } } /* copy everything after last occurrence of str. */ memcpy(new_argz_iter, last_iter, *argz + *argz_len - last_iter); /* reallocate argz, and copy over the new value. */ if(!(*argz = (char *)realloc(*argz, new_argz_len))) return ENOMEM; memcpy(*argz, new_argz, new_argz_len); *argz_len = new_argz_len; if (*argz_len == 0) { free(*argz); *argz = NULL; } free(new_argz); } return 0; }