Trailing-Edge
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PDP-10 Archives
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SRI_NIC_PERM_FS_1_19910112
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c/lib5/stdio/fgets.c
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/*
* FGETS - get a string from stream
*
* Copyright (c) 1986 by Ian Macky, SRI International
*/
#include "stdio.h"
char *fgets(s, n, f)
char *s;
int n;
FILE *f;
{
int c;
char *org_s;
if (!_readable(f) || n <= 1)
return NULL; /* validation/sanity checks */
org_s = s; /* save original string ptr */
/*
* suck until the requested count (n) reaches one (to leave space
* for the terminating null), a newline is seen, or there are no
* more characters
*/
while (n-- > 1 && (c = getc(f)) != EOF)
if ((*s++ = c) == '\n') break;
/*
* if nothing was read at all then just return a NULL pointer
* immediately, don't null-terminate the string.
*/
if (s == org_s) return NULL;
else {
*s = '\0';
return org_s;
}
}