C concatenate and allocate string

C concatenate strings

char str[80];
strcpy(str, "these ");
strcat(str, "strings ");
strcat(str, "are ");
strcat(str, "concatenated.");

C concatenate and allocate string

// null protected
char* strconcat(char *str1, const char *str2)
{
	char *str = NULL;
    size_t len1 = 0;
    size_t len2 = 0;

	if (str1)
    	len1 = strlen(str1);
    if (str2)
    	len2 = strlen(str2);
    if (!(str = calloc(sizeof(char), (len1 + len2 + 1))))
        return NULL;
    if (str1)
        memcpy(str, str1, len1);
    if (str2)
        memcpy(str + len1, str2, len2);
    return (str);
}

Similar codes

0 vote381 views1 answer
Pyramid using c
C
1 vote380 views1 answer
Adb switch to usb
C
-1 vote393 views1 answer
C find last element in array
C
0 vote383 views1 answer
Macos prevent disk mounting
C
2 votes416 views10 answers
Javascript
C
0 vote390 views1 answer
CL/cl.h: No such file or directory
C
0 vote353 views1 answer
C include delay
C
1 vote417 views2 answers
Bash convert find to array
C
1 vote397 views1 answer
Thread in c
C
7 votes377 views3 answers
Int to double c
C