mirror of
git://projects.qi-hardware.com/ben-wpan.git
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187 lines
2.9 KiB
C
187 lines
2.9 KiB
C
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/*
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* lib/netio.c - Helper functions for socket I/O
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*
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* Written 2011 by Werner Almesberger
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* Copyright 2011 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdarg.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/types.h>
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#include "netio.h"
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#define BUFFER 1024
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struct netio {
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int s;
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uint8_t *pos;
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int size;
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uint8_t buf[BUFFER];
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};
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int netio_verbose = 0;
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static void display(uint8_t c)
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{
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fputc((c >= ' ' && c <= '~') || c == '\n' ? c : '?', stderr);
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}
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int netio_getc(struct netio *dsc, uint8_t *res)
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{
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ssize_t got;
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while (!dsc->size) {
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got = read(dsc->s, dsc->buf, BUFFER);
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if (got < 0) {
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perror("read");
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return -1;
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}
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if (!got)
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return 0;
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dsc->pos = dsc->buf;
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dsc->size = got;
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}
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dsc->size--;
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*res = *dsc->pos++;
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if (netio_verbose)
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display(*res);
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return 1;
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}
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ssize_t netio_read_until(struct netio *dsc, const char *end, void *buf,
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size_t len, char *last)
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{
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size_t left;
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const char *term;
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for (left = len; left; left--)
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switch (netio_getc(dsc, buf)) {
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case 1:
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buf++;
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term = strchr(end, ((char *) buf)[-1]);
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if (!term)
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break;
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if (!*term) {
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fprintf(stderr, "received NUL in text\n");
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return -1;
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}
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if (last)
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*last = ((char *) buf)[-1];
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return len-left; /* we don't count the terminator */
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case 0:
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if (last)
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*last = 0;
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return len-left;
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case -1:
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return -1;
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}
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fprintf(stderr, "buffer overrun\n");
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return -1;
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}
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ssize_t netio_read(struct netio *dsc, void *buf, size_t len)
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{
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size_t left;
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for (left = len; left; left--)
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switch (netio_getc(dsc, buf)) {
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case 1:
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buf++;
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break;
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case 0:
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return len-left;
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case -1:
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return -1;
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}
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return len;
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}
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int netio_write(struct netio *dsc, const void *data, size_t len)
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{
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const uint8_t *p;
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ssize_t left, wrote;
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if (netio_verbose)
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for (p = data; p != data+len; p++)
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display(*p);
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for (left = len; left; left -= wrote) {
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wrote = write(dsc->s, data, len);
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if (wrote < 0) {
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perror("write");
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return -1;
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}
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data += wrote;
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}
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return len;
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}
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int netio_printf(struct netio *dsc, const char *fmt, ...)
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{
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va_list ap;
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int n, res;
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char *buf;
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va_start(ap, fmt);
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n = vsnprintf(NULL, 0, fmt, ap);
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va_end(ap);
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buf = malloc(n+1);
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if (!buf) {
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perror("malloc");
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return -1;
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}
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va_start(ap, fmt);
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vsprintf(buf, fmt, ap);
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va_end(ap);
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res = netio_write(dsc, buf, n);
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free(buf);
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return res;
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}
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struct netio *netio_open(int s)
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{
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struct netio *dsc;
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dsc = malloc(sizeof(*dsc));
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if (!dsc) {
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perror("malloc");
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return NULL;
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}
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dsc->s = s;
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dsc->size = 0;
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return dsc;
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}
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void netio_close(struct netio *dsc)
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{
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if (close(dsc->s) < 0)
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perror("close");
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free(dsc);
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}
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