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/*****************************************************************************
Copyright (c) 1994, 2014, Oracle and/or its affiliates. All Rights Reserved.
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; version 2 of the License.
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, write to the Free Software Foundation, Inc.,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
*****************************************************************************/
/********************************************************************//**
@file ut/ut0mem.cc
Memory primitives
Created 5/11/1994 Heikki Tuuri
*************************************************************************/
#include "ut0mem.h"
#ifdef UNIV_NONINL
#include "ut0mem.ic"
#endif
#include "os0thread.h"
#include "srv0srv.h"
#include <stdlib.h>
/**********************************************************************//**
Copies up to size - 1 characters from the NUL-terminated string src to
dst, NUL-terminating the result. Returns strlen(src), so truncation
occurred if the return value >= size.
@return strlen(src) */
ulint
ut_strlcpy(
/*=======*/
char* dst, /*!< in: destination buffer */
const char* src, /*!< in: source buffer */
ulint size) /*!< in: size of destination buffer */
{
ulint src_size = strlen(src);
if (size != 0) {
ulint n = ut_min(src_size, size - 1);
memcpy(dst, src, n);
dst[n] = '\0';
}
return(src_size);
}
/**********************************************************************//**
Like ut_strlcpy, but if src doesn't fit in dst completely, copies the last
(size - 1) bytes of src, not the first.
@return strlen(src) */
ulint
ut_strlcpy_rev(
/*===========*/
char* dst, /*!< in: destination buffer */
const char* src, /*!< in: source buffer */
ulint size) /*!< in: size of destination buffer */
{
ulint src_size = strlen(src);
if (size != 0) {
ulint n = ut_min(src_size, size - 1);
memcpy(dst, src + src_size - n, n + 1);
}
return(src_size);
}
/**********************************************************************//**
Return the number of times s2 occurs in s1. Overlapping instances of s2
are only counted once.
@return the number of times s2 occurs in s1 */
ulint
ut_strcount(
/*========*/
const char* s1, /*!< in: string to search in */
const char* s2) /*!< in: string to search for */
{
ulint count = 0;
ulint len = strlen(s2);
if (len == 0) {
return(0);
}
for (;;) {
s1 = strstr(s1, s2);
if (!s1) {
break;
}
count++;
s1 += len;
}
return(count);
}
/********************************************************************
Concatenate 3 strings.*/
char*
ut_str3cat(
/*=======*/
/* out, own: concatenated string, must be
freed with ut_free() */
const char* s1, /* in: string 1 */
const char* s2, /* in: string 2 */
const char* s3) /* in: string 3 */
{
char* s;
ulint s1_len = strlen(s1);
ulint s2_len = strlen(s2);
ulint s3_len = strlen(s3);
s = static_cast<char*>(ut_malloc_nokey(s1_len + s2_len + s3_len + 1));
memcpy(s, s1, s1_len);
memcpy(s + s1_len, s2, s2_len);
memcpy(s + s1_len + s2_len, s3, s3_len);
s[s1_len + s2_len + s3_len] = '\0';
return(s);
}
/**********************************************************************//**
Replace every occurrence of s1 in str with s2. Overlapping instances of s1
are only replaced once.
@return own: modified string, must be freed with ut_free() */
char*
ut_strreplace(
/*==========*/
const char* str, /*!< in: string to operate on */
const char* s1, /*!< in: string to replace */
const char* s2) /*!< in: string to replace s1 with */
{
char* new_str;
char* ptr;
const char* str_end;
ulint str_len = strlen(str);
ulint s1_len = strlen(s1);
ulint s2_len = strlen(s2);
ulint count = 0;
int len_delta = (int) s2_len - (int) s1_len;
str_end = str + str_len;
if (len_delta <= 0) {
len_delta = 0;
} else {
count = ut_strcount(str, s1);
}
new_str = static_cast<char*>(
ut_malloc_nokey(str_len + count * len_delta + 1));
ptr = new_str;
while (str) {
const char* next = strstr(str, s1);
if (!next) {
next = str_end;
}
memcpy(ptr, str, next - str);
ptr += next - str;
if (next == str_end) {
break;
}
memcpy(ptr, s2, s2_len);
ptr += s2_len;
str = next + s1_len;
}
*ptr = '\0';
return(new_str);
}
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