nonstdio.c

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/*
 * Copyright (C) 1996-2005 Paul Mackerras.
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */
#include <linux/string.h>
#include <asm/time.h>
#include "nonstdio.h"

int xmon_putchar(int c)
{
    char ch = c;

    if (c == '\n')
        xmon_putchar('\r');
    return xmon_write(&ch, 1) == 1? c: -1;
}

static char line[256];
static char *lineptr;
static int lineleft;

int xmon_expect(const char *str, unsigned long timeout)
{
    int c;
    unsigned long t0;

    /* assume 25MHz default timebase if tb_ticks_per_sec not set yet */
    timeout *= tb_ticks_per_sec? tb_ticks_per_sec: 25000000;
    t0 = get_tbl();
    do {
        lineptr = line;
        for (;;) {
            c = xmon_read_poll();
            if (c == -1) {
                if (get_tbl() - t0 > timeout)
                    return 0;
                continue;
            }
            if (c == '\n')
                break;
            if (c != '\r' && lineptr < &line[sizeof(line) - 1])
                *lineptr++ = c;
        }
        *lineptr = 0;
    } while (strstr(line, str) == NULL);
    return 1;
}

int xmon_getchar(void)
{
    int c;

    if (lineleft == 0) {
        lineptr = line;
        for (;;) {
            c = xmon_readchar();
            if (c == -1 || c == 4)
                break;
            if (c == '\r' || c == '\n') {
                *lineptr++ = '\n';
                xmon_putchar('\n');
                break;
            }
            switch (c) {
            case 0177:
            case '\b':
                if (lineptr > line) {
                    xmon_putchar('\b');
                    xmon_putchar(' ');
                    xmon_putchar('\b');
                    --lineptr;
                }
                break;
            case 'U' & 0x1F:
                while (lineptr > line) {
                    xmon_putchar('\b');
                    xmon_putchar(' ');
                    xmon_putchar('\b');
                    --lineptr;
                }
                break;
            default:
                if (lineptr >= &line[sizeof(line) - 1])
                    xmon_putchar('\a');
                else {
                    xmon_putchar(c);
                    *lineptr++ = c;
                }
            }
        }
        lineleft = lineptr - line;
        lineptr = line;
    }
    if (lineleft == 0)
        return -1;
    --lineleft;
    return *lineptr++;
}

char *xmon_gets(char *str, int nb)
{
    char *p;
    int c;

    for (p = str; p < str + nb - 1; ) {
        c = xmon_getchar();
        if (c == -1) {
            if (p == str)
                return NULL;
            break;
        }
        *p++ = c;
        if (c == '\n')
            break;
    }
    *p = 0;
    return str;
}

void xmon_printf(const char *format, ...)
{
    va_list args;
    int n;
    static char xmon_outbuf[1024];

    va_start(args, format);
    n = vsnprintf(xmon_outbuf, sizeof(xmon_outbuf), format, args);
    va_end(args);
    xmon_write(xmon_outbuf, n);
}

void xmon_puts(const char *str)
{
    xmon_write(str, strlen(str));
}