C中如何实现replace函数功能

各位大侠，由于数据库中无replace函数，因此要外部用C语言写一个replace函数，然后装载进数据库供其使用。
我在网上找了个，但是编译不通过，望各位大侠帮忙提供一个，或者修改下面这个，谢谢！

void replace2
(VARCHAR_LATIN input_string,
VARCHAR_LATIN search_string,
VARCHAR_LATIN replace_string,
VARCHAR_LATIN result_string,
int *input_string_indicator,
int *search_string_indicator,
int *replace_string_indicator,
int *result_string_indicator,
char sqlstate[6],
SQL_TEXT extname[129],
SQL_TEXT specific_name[129],
SQL_TEXT error_message[257])
{
int source_length;
int search_length;
int replace_length;
unsigned char *source_ptr;
unsigned char *source_limit;
unsigned char *match_limit;
unsigned char *save_source_ptr;
unsigned char *target_ptr;
unsigned char *target_limit;
unsigned char *search_ptr;
unsigned char *search_limit;


if (*input_string_indicator == IS_NULL)
{
*result_string_indicator = IS_NULL;

(void) strcpy(sqlstate, UDF_OK);
error_message[0] = EOS;

return;
}

source_length = strlen((char *) input_string);

if (*replace_string_indicator == IS_NOT_NULL)
replace_length = strlen((char *) replace_string);
else
replace_length = 0;

/* Don't search if it is impossible to get a match. */

if ((source_length == 0) ||
(*search_string_indicator == IS_NULL) ||
((search_length = strlen((char *) search_string)) == 0) ||
(search_length > source_length))
{
if (source_length > MAXIMUM_LENGTH)
{
*result_string_indicator = IS_NULL;

(void) sprintf(sqlstate, UDF_ERR_RESULTLENGTH1);
(void) strcpy((char *) error_message, UDF_MSG_RESULTLENGTH1);

return;
}

(void) strcpy((char *) result_string, (char *) input_string);

*result_string_indicator = IS_NOT_NULL;

(void) strcpy(sqlstate, UDF_OK);
error_message[0] = EOS;

return;
}

source_ptr = input_string;
source_limit = input_string + source_length;
match_limit = (source_limit - search_length) + 1;
target_ptr = result_string;
target_limit = result_string + MAXIMUM_LENGTH;
search_ptr = search_string;
search_limit = search_string + search_length;

while (source_ptr < source_limit)
{
if ((*search_ptr == *source_ptr) && (source_ptr < match_limit))
{
/* Possible match. Check remainder of pattern */

save_source_ptr = source_ptr;

while ((++search_ptr < search_limit) &&
(*search_ptr == *(++source_ptr)));

if (search_ptr == search_limit)
{
/* Pattern match. */

++source_ptr;

if (replace_length > 0)
{
/* Substitute new value. */

*target_ptr = EOS;

if (((target_ptr + replace_length) - 1) >= target_limit)
{
*result_string_indicator = IS_NULL;

(void) sprintf(sqlstate, UDF_ERR_RESULTLENGTH2);
(void) strcpy((char *) error_message,
UDF_MSG_RESULTLENGTH2);

return;
}

strcat((char *) target_ptr, (char *) replace_string);

target_ptr += replace_length;
}
}
else
{
source_ptr = save_source_ptr;

if (target_ptr == target_limit)
{
*result_string_indicator = IS_NULL;

(void) sprintf(sqlstate, UDF_ERR_RESULTLENGTH3);
(void) strcpy((char *) error_message,
UDF_MSG_RESULTLENGTH3);

return;
}

*(target_ptr++) = *(source_ptr++);
}

search_ptr = search_string;
}
else
{
if (target_ptr == target_limit)
{
*result_string_indicator = IS_NULL;

(void) sprintf(sqlstate, UDF_ERR_RESULTLENGTH4);
(void) strcpy((char *) error_message, UDF_MSG_RESULTLENGTH4);

return;
}

*(target_ptr++) = *(source_ptr++);
}
}

*target_ptr = EOS;

*result_string_indicator = IS_NOT_NULL;

(void) strcpy(sqlstate, UDF_OK);
error_message[0] = EOS;
}



谢谢！

顶啊，各位大侠。

strstr()找到源字符串
memmove()把源字符串后面的字符串移动到指定位置
然后用strncpy()把目标字符串写入到中间的空隙上。