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Dynscpy.c
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C/C++ Source or Header
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2001-12-16
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2KB
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77 lines
#include "syshdrs.h"
#ifdef PRAGMA_HDRSTOP
# pragma hdrstop
#endif
/* Use Dynscpy when you want to manage free'ing the created pointer
* yourself; Dynsrecpy will try to free an existing pointer if needed
* before creating the new string, but you have to be sure to be sure
* initialize the pointer to NULL the first time you use it..
*
* Example:
*
* {
* char *p; -* p contains garbage *-
* Dynscpy(&p, "foo", "bar", 0); -* no need to initialize p *-
* free(p); -* must free p to avoid leak *-
* Dynscpy(&p, "hello", "world", 0); -* p can now be reused *-
* free(p); -* must free p to avoid leak *-
* Dynscpy(&p, "test", "123", 0); -* p can now be reused *-
* free(p); -* free p when finished *-
* }
*
* {
* char *p;
* p = NULL; -* Must init p to NULL, else free() will get garbage *-
* Dynsrecpy(&p, "foo", "bar", 0); -* on this call to Dynsrecpy *-
* Dynsrecpy(&p, "hello", "world", 0); -* p will be freed *-
* Dynsrecpy(&p, "test", "123", 0); -* p will be freed *-
* free(p); -* free p when finished *-
* }
*/
/*VARARGS*/
char *
Dynscpy(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);
curLen = 0;
newdst = malloc(curLen + catLen + 2);
if (newdst == NULL) {
*dst = 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);
} /* Dynscpy */