Dynscat.c

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#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include "Strn.h"
 
/*VARARGS*/
char *
Dynscat(char **dst, ...)
{
    va_list ap;
    const char *src;
    char *newdst, *dcp;
    size_t curLen, catLen, srcLen;
 
    if (dst == (char **) 0)
        return NULL;
 
    catLen = 0;
    va_start(ap, dst);
    src = va_arg(ap, char *);
    while (src != NULL) {
        catLen += strlen(src);
        src = va_arg(ap, char *);
    }
    va_end(ap);
 
    if ((*dst == NULL) || (**dst == '\0'))
        curLen = 0;
    else
        curLen = strlen(*dst);
 
    if (*dst == NULL)
        newdst = malloc(curLen + catLen + 2);
    else
        newdst = realloc(*dst, curLen + catLen + 2);
    if (newdst == NULL)
        return NULL;
 
    dcp = newdst + curLen;
    va_start(ap, dst);
    src = va_arg(ap, char *);
    while (src != NULL) {
        srcLen = strlen(src);
        memcpy(dcp, src, srcLen);
        dcp += srcLen;
        src = va_arg(ap, char *);
    }
    va_end(ap);
    *dcp = '\0';
 
    *dst = newdst;
    return (newdst);
}   /* Dynscat */