Re: String Manipulation Functions - strcpy, strncpy

From: (Carl Barron)
Mon, 2 Apr 2007 00:57:44 CST
<> wrote:

1. Can someone tell me the difference between these two functions:

void strcpy(char *s1, const char *s2)
   while(*s1++ = *s2++)


//function prototype of strcpy follows
char *strcpy(char *s1, const char *s2) // library function

Both functions are doing the same job.
Why the later function has to return a char pointer?

We call both functions in the same manner and we don't sssign the
return pointer to any other pointer. Correct me if I'm wrong.

  C and C++ allow ignoring thee return value of a function, returning
a char * allows chaining of functions together which can be important,
as in this C code [or C++ code using nothing but C]

char * combine(const char *p,const char *q)
    unsigned long new_size = strlen(p)+strlen(q)+1;
    char *out = malloc(new_size);
    return out;

in C++ I use std::string unless there is a reasoon not, definitely not
this code without guarding ageninst leaks, the C++ code I'd use if I was
given two C strings is probably

intine std::string combine(const char *p,const char *q)
   std::string out(p);
   return out.append(q);

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