69 lines
1.2 KiB
C
69 lines
1.2 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include "linebuffer.h"
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struct linebuffer * create_linebuffer(int size)
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{
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struct linebuffer *retval = malloc(sizeof(struct linebuffer) + size);
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if (retval == NULL)
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return NULL;
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retval->size = size;
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retval->pos = 0;
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return retval;
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}
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int linebuffer_read(struct linebuffer *lbuf, int fd)
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{
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char buf[32];
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int len = read(fd, buf, sizeof(buf));
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if (len <= 0)
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return -1;
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int i;
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for (i = 0; i < len; i++) {
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/* "understand" backspace */
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if (buf[i] == 0x08 && lbuf->pos > 0) {
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lbuf->pos--;
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/* copy */
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} else if (buf[i] >= ' ' || buf[i] == '\r') {
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lbuf->data[lbuf->pos++] = buf[i];
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}
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if (lbuf->pos > lbuf->size)
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return -1;
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}
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return 0;
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}
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char * linebuffer_get(struct linebuffer *lbuf)
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{
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char *newline = memchr(lbuf->data, '\r', lbuf->pos);
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if (newline == NULL)
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return NULL;
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char *retval = NULL;
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*newline = '\0';
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int len = newline - lbuf->data;
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if (len > 0)
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retval = strdup(lbuf->data);
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lbuf->pos -= len +1;
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memmove(lbuf->data, newline +1, lbuf->pos);
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return retval;
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}
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int linebuffer_clear(struct linebuffer *lbuf)
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{
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int oldpos = lbuf->pos;
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lbuf->pos = 0;
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return oldpos;
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}
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