Le 24/01/2016 19:14, KatolaZ a écrit :
Soo, the above is nearly the same as
>
> char buf[total];
> p = buf;
>
>Why then use alloca()?
>
Maybe because
char buf[total];
works only in ANSI C11. I still don't see the need for an internal
buffer to print out a formatted string, to be honest:)
The following works in plain old C:
#include <stdio.h>
#include <string.h>
static void print_start(char const *name, char const *what)
{
unsigned name_len, what_len, total;
name_len = strlen(name);
what_len = strlen(what);
total = name_len + what_len + 3;
{
char buf[total], *p=buf;
memcpy(p, name, name_len);
p += name_len;
*p++ = ' ';
memcpy(p, what, what_len);
p += what_len;
*p++ = ':';
*p = ' ';
*buf &= ~0x20;
Write(2, buf, total);
}
}
Embedded subprograms have other use cases. In long programs, they
allow to declare variables with a limited scope, just near where they
are used.
Didier
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