mirror of
https://github.com/openharmony/third_party_sane-airscan.git
synced 2026-06-30 21:17:55 -04:00
Alexander Pevzner
60 lines
1.0 KiB
C
60 lines
1.0 KiB
C
/* AirScan (a.k.a. eSCL) backend for SANE
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*
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* Copyright (C) 2019 and up by Alexander Pevzner (pzz@apevzner.com)
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* See LICENSE for license terms and conditions
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*
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* Random bytes generator
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*/
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#include "airscan.h"
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#pragma GCC diagnostic ignored "-Wunused-result"
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#define RAND_SOURCE "/dev/urandom"
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static FILE *rand_fp;
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/* Get N random bytes
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*/
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void
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rand_bytes (void *buf, size_t n)
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{
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log_assert(NULL, rand_fp != NULL);
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/* Read from /dev/urandom never fails
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* */
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(void) fread(buf, 1, n, rand_fp);
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}
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/* Initialize random bytes generator
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*/
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SANE_Status
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rand_init (void)
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{
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rand_fp = fopen(RAND_SOURCE, "rb");
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if (rand_fp == NULL) {
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log_debug(NULL, "%s: %s", RAND_SOURCE, strerror(errno));
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return SANE_STATUS_IO_ERROR;
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}
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return SANE_STATUS_GOOD;
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}
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/* Cleanup random bytes generator
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*/
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void
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rand_cleanup (void)
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{
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if (rand_fp != NULL) {
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fclose(rand_fp);
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rand_fp = NULL;
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}
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}
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/* vim:ts=8:sw=4:et
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*/
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