source: buchla-68k/orig/IOLIB/FGETS.C@ d21fc6f

/*
   =============================================================================
        fgets.c -- get a string from an ASCII stream file
        Version 2 -- 1987-07-09 -- D.N. Lynx Crowe
   =============================================================================
*/

#include "stdio.h"
#include "stddefs.h"

#define EATCHAR '\n'    /* character to be "eaten" on input */

int
agetc(ptr)
register FILE *ptr;
{
        register int c;

top:
        if ((c = getc(ptr)) NE EOF) {

                switch (c &= 0x7F) {

                case 0x1a:              /* {x}DOS EOF */
                        --ptr->_bp;
                        return(EOF);

                case EATCHAR:           /* CR or LF */
                case 0:                 /* NUL */
                        goto top;
                }
        }

        return(c);
}

char *
gets(line)
char *line;
{
        register char *cp;
        register int i;

        cp = line;

        while ((i = getchar()) NE EOF AND i NE '\n')
                *cp++ = i;

        *cp = 0;        /* terminate the line */

        if ((i EQ EOF) AND (cp EQ line))
                return(NULL);

        return(line);
}

char *
fgets(s, n, fp)
char *s;
int n;
FILE *fp;
{
        register c;
        register char *cp;

        cp = s;

        while (--n > 0 AND (c = agetc(fp)) NE EOF) {

                *cp++ = c;

                if (c EQ '\n')
                        break;
        }

        *cp = 0;

        if (c EQ EOF AND cp EQ s)
                return(NULL);

        return(s);
}