concat.c File Reference

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>

Go to the source code of this file.

Functions
char *	concat (char *str,...)
int	main (void)

Detailed Description

• cviceni na variadic args se zarazkou, stejny typ argumentu
• Note: nelze funkce(...)
• Note: u C99 mame variadicka makra!!! #define makrargs(...) ..._VA_ARGS__

Dalsi varianty:

• concat do bufferu dodaneho volajicim
• join retezcu se separatorem

Definition in file concat.c.

Function Documentation

char* concat	(	char *	str,
			...
	)

spoji ruzny pocet retezcu ukoncenych zarazkou NULL.

Parameters

str	prvni parametr musi byt uveden

Todo:

pokud str==NULL vracime ""?

Returns

nove alokovany retezec spojenych parametru

Definition at line 26 of file concat.c.

                               { //note: nelze (...)
  size_t len;
  char *pch, *result;
  va_list args;
//co delat pokud str==NULL?
  if (NULL==str)
     return strdup("");
//1. pruchod spocitame delku
  len = strlen(str);
  va_start(args, str);
  while (pch = va_arg(args, char *)) {
    len += strlen(pch);
  }
  result = (char*)malloc(len+1);
//va_end(args);//musime pred novym va_start()?
//2. pruchod, append-ujeme
  va_start(args, str);
  strcpy(result, str);
  while (pch = va_arg(args, char *)) {
    strcat(result, pch);
  }
  va_end(args);
  return result;
}