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Replace substring with other string

/ Published in: C
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The original string (str) will be changed after calling this function, so if you need it make a copy of it.

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  1. /**
  2.  * Return a string with all occurrences of substring sub replaced by rep.
  3.  * @param str The original string
  4.  * @param sub The substring to be replace
  5.  * @param rep The replacement
  6.  * @return The new string
  7. */
  8. char *replace_str(char *str, char *sub, char *rep)
  9. {
  10.   static char buffer[4096];
  11.   char *p;
  12.  
  13.   if(! (p = strstr(str, orig)))  // Is 'orig' even in 'str'?
  14.     return str;
  15.  
  16.   strncpy(buffer, str, p - str); // Copy characters from 'str' start to 'orig' st$
  17.   buffer[p - str] = '\0';
  18.  
  19.   sprintf(buffer + (p - str), "%s%s", rep, p + strlen(orig));
  20.  
  21.   return buffer;
  22. }

URL: http://www.linuxquestions.org/questions/programming-9/replace-a-substring-with-another-string-in-c-170076/

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