getarg.c

来自「Simple C Compiler, Release 0.1.6 Simple」· C语言 代码 · 共 33 行

#include <stdio.h>
/*
** Get command line argument. 
** Entry: n    = Number of the argument.
**        s    = Destination string pointer.
**        size = Size of destination string.
**        argc = Argument count from main().
**        argv = Argument vector(s) from main().
** Returns number of characters moved on success,
** else EOF.
*/
getarg(n, s, size, argc, argv)
int n;
char *s;
int size, argc, argv[];
{
    char *str;
    int i;
    if (n < 0 | n >= argc) {
	*s = NULL;
	return EOF;
    }
    i = 0;
    str = argv[n];
    while (i < size) {
	if ((s[i] = str[i]) == NULL)
	    break;
	++i;
    }
    s[i] = NULL;
    return i;
}