100 lines
2.5 KiB
C
100 lines
2.5 KiB
C
#include "input.h"
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#include <string.h>
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#include "platform.h"
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inline size_t min_size(size_t a, size_t b) {
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return a < b ? a : b;
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}
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void InputBufferTransfer(struct InputBuffer *dest, struct InputBuffer *src)
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{
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size_t copy_amt = min_size(IO_BUF_SIZE - dest->len, src->len);
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for (size_t i = 0; i < dest->start; i++) {
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size_t dest_i = (dest->start + dest->len + i) % IO_BUF_SIZE;
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size_t src_i = (src->start + i) % IO_BUF_SIZE;
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dest->buf[dest_i] = src->buf[src_i];
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}
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dest->start += copy_amt;
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if (copy_amt < src->len)
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src->len -= copy_amt;
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}
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void InputStringTransfer(struct InputString *dest, struct InputString *src)
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{
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size_t copy_amt = min_size(STR_BUF_SIZE - dest->len, src->len);
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for (size_t i = 0; i < copy_amt; i++) {
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size_t dest_i = (dest->start + dest->len + i) % STR_BUF_SIZE;
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size_t src_i = (src->start + i) % STR_BUF_SIZE;
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dest->buf[dest_i] = src->buf[src_i];
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}
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dest->start += copy_amt;
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if (copy_amt < src->len)
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src->len -= copy_amt;
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}
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void *input_thread_loop(void *arg)
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{
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struct InputThreadHandle *hand = arg;
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struct InputBuffer tmp_in = { .len = 0 };
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struct InputString tmp_str = { .len = 0 };
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while (!hand->is_terminating) {
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if (!PlatformReadInput(&tmp_in, &tmp_str)) {
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hand->err = true;
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return nullptr;
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}
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hand->err = pthread_mutex_lock(&hand->mutex);
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if (hand->err)
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return nullptr;
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while (tmp_in.len == IO_BUF_SIZE) {
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hand->err = pthread_cond_wait(&hand->buf_read, &hand->mutex);
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if (hand->err)
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return nullptr;
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}
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InputBufferTransfer(hand->in, &tmp_in);
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InputStringTransfer(hand->str, &tmp_str);
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hand->err = pthread_mutex_unlock(&hand->mutex);
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if (hand->err)
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return nullptr;
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}
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return nullptr;
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}
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bool BeginInputThread(struct InputThreadHandle *hand, struct InputBuffer *buf)
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{
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hand->in = buf;
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hand->mutex = PTHREAD_MUTEX_INITIALIZER;
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hand->buf_read = PTHREAD_COND_INITIALIZER;
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hand->err = 0;
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return pthread_create(&hand->thread, nullptr, input_thread_loop, hand) == 0;
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}
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bool EndInputThread(struct InputThreadHandle *hand)
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{
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hand->is_terminating = true;
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if (!PlatformStopInput())
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return false;
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if (!pthread_mutex_destroy(&hand->mutex))
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return false;
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if (!pthread_join(hand->thread, nullptr))
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return false;
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return true;
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} |