a C standard library for fx Casio calculators
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fxlibc/src/libc/stdio/puts.c

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#include <stdio.h>
#include <string.h>
#include <unistd.h>
/*
** puts() writes the string s and a trailing newline to stdout.
** FIXME: check last write error !
*/
int puts(const char *s)
{
size_t size;
size_t n;
size = strlen(s);
n = write(STDOUT_FILENO, s, size);
write(STDOUT_FILENO, "\n", 1);
return (-(n == size));
}