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/*              Case-independent string comparison              HTString.c
**
**      Original version came with listserv implementation.
**      Version TBL Oct 91 replaces one which modified the strings.
**      02-Dec-91 (JFG) Added stralloccopy and stralloccat
**      23 Jan 92 (TBL) Changed strallocc* to 8 char HTSAC* for VM and suchlike
*/

#include <ctype.h>
#include "HTUtils.h"
#include "tcp.h"

#ifndef VM              /* VM has these already it seems */
       
/*      Strings of any length
**      ---------------------
*/

PUBLIC int strcasecomp ARGS2 (CONST char*,a, CONST char *,b)
{
        CONST char *p =a;
        CONST char *q =b;
        for(p=a, q=b; *p && *q; p++, q++) {
            int diff = TOLOWER(*p) - TOLOWER(*q);
            if (diff) return diff;
        }
        if (*p) return 1;       /* p was longer than q */
        if (*q) return -1;      /* p was shorter than q */
        return 0;               /* Exact match */
}


/*      With count limit
**      ----------------
*/

PUBLIC int strncasecomp ARGS3(CONST char*,a, CONST char *,b, int,n)
{
        CONST char *p =a;
        CONST char *q =b;
       
        for(p=a, q=b;; p++, q++) {
            int diff;
            if (p == a+n) return 0;     /*   Match up to n characters */
            if (!(*p && *q)) return *p - *q;
            diff = TOLOWER(*p) - TOLOWER(*q);
            if (diff) return diff;
        }
        /*NOTREACHED*/
}
#endif

/*      Allocate a new copy of a string, and returns it
*/

PUBLIC char * HTSACopy
  ARGS2 (char **,dest, CONST char *,src)
{
  if (*dest) free(*dest);
  if (! src)
    *dest = NULL;
  else {
    *dest = (char *) malloc (strlen(src) + 1);
    if (*dest == NULL) outofmem(__FILE__, "HTSACopy");
    strcpy (*dest, src);
  }
  return *dest;
}

PUBLIC char * HTSACat
  ARGS2 (char **,dest, CONST char *,src)
{
  if (src && *src) {
    if (*dest) {
      int length = strlen (*dest);
      *dest = (char *) realloc (*dest, length + strlen(src) + 1);
      if (*dest == NULL) outofmem(__FILE__, "HTSACat");
      strcpy (*dest + length, src);
    } else {
      *dest = (char *) malloc (strlen(src) + 1);
      if (*dest == NULL) outofmem(__FILE__, "HTSACat");
      strcpy (*dest, src);
    }
  }
  return *dest;
}