Supprimer une sous-chaîne d'une chaîne?

Quelqu'un d'autre a une chaîne C de rechercher et de remplacer la fonction de ce que vous pourriez trouver utiles ici.

edit: inclus l'extrait de code à partir du lien ci-dessous, comme par commentaire demande

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*
* Description:
*   Find and replace text within a string.
*
* Parameters:
*   src  (in) - pointer to source string
*   from (in) - pointer to search text
*   to   (in) - pointer to replacement text
*
* Returns:
*   Returns a pointer to dynamically-allocated memory containing string
*   with occurences of the text pointed to by 'from' replaced by with the
*   text pointed to by 'to'.
*/
char *replace(const char *src, const char *from, const char *to)
{
/*
* Find out the lengths of the source string, text to replace, and
* the replacement text.
*/
size_t size    = strlen(src) + 1;
size_t fromlen = strlen(from);
size_t tolen   = strlen(to);
/*
* Allocate the first chunk with enough for the original string.
*/
char *value = malloc(size);
/*
* We need to return 'value', so let's make a copy to mess around with.
*/
char *dst = value;
/*
* Before we begin, let's see if malloc was successful.
*/
if ( value != NULL )
{
/*
* Loop until no matches are found.
*/
for ( ;; )
{
/*
* Try to find the search text.
*/
const char *match = strstr(src, from);
if ( match != NULL )
{
/*
* Found search text at location 'match'. :)
* Find out how many characters to copy up to the 'match'.
*/
size_t count = match - src;
/*
* We are going to realloc, and for that we will need a
* temporary pointer for safe usage.
*/
char *temp;
/*
* Calculate the total size the string will be after the
* replacement is performed.
*/
size += tolen - fromlen;
/*
* Attempt to realloc memory for the new size.
*/
temp = realloc(value, size);
if ( temp == NULL )
{
/*
* Attempt to realloc failed. Free the previously malloc'd
* memory and return with our tail between our legs. :(
*/
free(value);
return NULL;
}
/*
* The call to realloc was successful. :) But we'll want to
* return 'value' eventually, so let's point it to the memory
* that we are now working with. And let's not forget to point
* to the right location in the destination as well.
*/
dst = temp + (dst - value);
value = temp;
/*
* Copy from the source to the point where we matched. Then
* move the source pointer ahead by the amount we copied. And
* move the destination pointer ahead by the same amount.
*/
memmove(dst, src, count);
src += count;
dst += count;
/*
* Now copy in the replacement text 'to' at the position of
* the match. Adjust the source pointer by the text we replaced.
* Adjust the destination pointer by the amount of replacement
* text.
*/
memmove(dst, to, tolen);
src += fromlen;
dst += tolen;
}
else /* No match found. */
{
/*
* Copy any remaining part of the string. This includes the null
* termination character.
*/
strcpy(dst, src);
break;
}
}
}
return value;
}
void test(const char *source, const char *search, const char *repl)
{
char *after;
after = replace(source, search, repl);
printf("\nsearch = \"%s\", repl = \"%s\"\n", search, repl);
if ( after != NULL )
{
printf("after  = \"%s\"\n", after);
free(after);
}
}
int main(void)
{
const char before[] = "the rain in Spain falls mainly on the plain";
printf("before = \"%s\"\n", before);
test(before, "the", "THEE");
test(before, "the", "A");
test(before, "cat", "DOG");
test(before, "plain", "PLANE");
test(before, "ain", "AINLY");
return 0;
}
/* my output
before = "the rain in Spain falls mainly on the plain"
search = "the", repl = "THEE"
after  = "THEE rain in Spain falls mainly on THEE plain"
search = "the", repl = "A"
after  = "A rain in Spain falls mainly on A plain"
search = "cat", repl = "DOG"
after  = "the rain in Spain falls mainly on the plain"
search = "plain", repl = "PLANE"
after  = "the rain in Spain falls mainly on the PLANE"
search = "ain", repl = "AINLY"
after  = "the rAINLY in SpAINLY falls mAINLYly on the plAINLY"
*/

Espère que cette aide.

Au lieu de les enlever, vous pouvez simplement les ignorer, par exemple, comme ceci:

#define KEY_TO_IGNORE "CHARSET=UTF-8"
char key[80];
char value[80];
char *text = "FN;CHARSET=UTF-8:David Celery";
sscanf(text, "%2s;" KEY_TO_IGNORE ":%s", key, value);
printf("key: %s, value: %s\n", key, value);