在C中替換字符串的函數(shù)是什么？給定一個(char*)字符串，我希望找到一個子字符串的所有匹配項，并將其替換為一個備用字符串。我沒有看到任何簡單的函數(shù)可以在<string.h>中實現(xiàn)這一點。
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三國紛爭
TA貢獻1804條經(jīng)驗 獲得超7個贊
// You must free the result if result is non-NULL.char *str_replace(char *orig, char *rep, char *with) {
char *result; // the return string
char *ins; // the next insert point
char *tmp; // varies
int len_rep; // length of rep (the string to remove)
int len_with; // length of with (the string to replace rep with)
int len_front; // distance between rep and end of last rep
int count; // number of replacements
// sanity checks and initialization
if (!orig || !rep)
return NULL;
len_rep = strlen(rep);
if (len_rep == 0)
return NULL; // empty rep causes infinite loop during count
if (!with)
with = "";
len_with = strlen(with);
// count the number of replacements needed
ins = orig;
for (count = 0; tmp = strstr(ins, rep); ++count) {
ins = tmp + len_rep;
}
tmp = result = malloc(strlen(orig) + (len_with - len_rep) * count + 1);
if (!result)
return NULL;
// first time through the loop, all the variable are set correctly
// from here on,
// tmp points to the end of the result string
// ins points to the next occurrence of rep in orig
// orig points to the remainder of orig after "end of rep"
while (count--) {
ins = strstr(orig, rep);
len_front = ins - orig;
tmp = strncpy(tmp, orig, len_front) + len_front;
tmp = strcpy(tmp, with) + len_with;
orig += len_front + len_rep; // move to next "end of rep"
}
strcpy(tmp, orig);
return result;}
明月笑刀無情
TA貢獻1828條經(jīng)驗 獲得超4個贊
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