InsertAt.c

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#include                <string.h>
#include                "libFireBird.h"
 
void InsertAt(const char *SourceString, int Pos, char *NewString)
{
  TRACEENTER();
 
  char                 *dst, *src;
  char                 *Target;
  int                   OldLen, NewLen;
 
  if(!SourceString || !NewString)
  {
    TRACEEXIT();
    return;
  }
 
  src = SkipCharTableBytes(SourceString);
 
  if(Pos >= (int)strlenUC(src))
  {
    strcat(src, NewString);
 
    TRACEEXIT();
    return;
  }
 
  if(Pos < 0) Pos = 0;
 
  OldLen = strlen(src);
  NewLen = strlen(NewString);
 
  dst = &src[OldLen + NewLen];
  *dst = '\0';
  dst--;
 
  Target = GetUCPos(src, Pos);
  src = &src[OldLen - 1];
 
  while(src >= Target)
  {
    *dst = *src;
    dst--;
    src--;
  }
 
  memcpy(Target, NewString, NewLen);
 
  TRACEEXIT();
}