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

29 votes449 views1 answer
C challenge
C
0 vote383 views1 answer
Grep C hello world
C
2 votes384 views2 answers
Joins in update query
C
0 vote398 views1 answer
Como hacer para que una salida en linux aparezca de poco en poco
C
-3 votes363 views2 answers
How to return a char array from a function in C
C
-1 vote380 views2 answers
C program
C
0 vote356 views1 answer
Arcolinux
C
2 votes400 views1 answer
Ln: failed to create symbolic link 'protoc': File exists
C
0 vote383 views1 answer
Meaning of &variable c
C
0 vote386 views1 answer
Pandoc set margins pdf
C