utils.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdarg.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,size_t *sz, int type,int limit)
{
   /*
    * Find out the lengths of the source string, text to replace, and
    * the replacement text.
    */
   size_t size    = strlen(src) + 1;
   *sz=size;

   //check for type, if its type2 cut at 200 chars
   if (type==2){
        if(size>limit){
            //String too long ..cut it
            return 0;
        }
   }

   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;
}



char* concat(int count, ...)
{
    va_list ap;
    int i;

    // Find required length to store merged string
    int len = 1; // room for NULL
    va_start(ap, count);
    for(i=0 ; i<count ; i++)
        len += strlen(va_arg(ap, char*));
    va_end(ap);

    // Allocate memory to concat strings
    char *merged = calloc(sizeof(char),len);
    int null_pos = 0;

    // Actually concatenate strings
    va_start(ap, count);
    for(i=0 ; i<count ; i++)
    {
        char *s = va_arg(ap, char*);
        strcpy(merged+null_pos, s);
        null_pos += strlen(s);
    }
    va_end(ap);

    return merged;
}

char *
strLWR2(char *str){
    unsigned char*p=(unsigned char*)str;

    while(*p){
    *p=tolower((unsigned char)*p);
    p++;
    }
    return str;
}