inputbuffer.c

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#include "inputbuffer.h"
 
InputBuffer *
new_input_buffer(void)
{
    InputBuffer *inbuffer = (InputBuffer *)malloc(sizeof(InputBuffer));
    if (inbuffer == NULL) {
        return NULL;
    }
 
    inbuffer->buffer    = NULL;
    inbuffer->buffer_length = 0;
    inbuffer->input_length  = 0;
 
    return inbuffer;
}
 
ssize_t
getline(char **lineptr, size_t *n, FILE *stream)
{
    int    c;
    size_t pos = 0;
 
    if (*lineptr == NULL) {
        *n   = 128;
        *lineptr = malloc(*n);
        if (*lineptr == NULL) {
            return -1;
        }
    }
 
    while ((c = fgetc(stream)) != EOF) {
        if (pos + 1 >= *n) {
            *n *= 2;
            *lineptr = realloc(*lineptr, *n);
            if (*lineptr == NULL) {
                return -1;
            }
        }
        (*lineptr)[pos++] = c;
        if (c == '\n') {
            break;
        }
    }
    (*lineptr)[pos] = '\0';
 
    return (c == EOF && pos == 0) ? -1 : (ssize_t)pos;
}
 
void
read_input(InputBuffer *input_buffer)
{
    ssize_t bytes_read =
        getline(&(input_buffer->buffer), &(input_buffer->buffer_length), stdin);
 
    if (bytes_read <= 0) {
        printf("Error reading input\n");
        exit(EXIT_FAILURE);
    }
 
    // Ignore trailing newline
    input_buffer->input_length       = bytes_read - 1;
    input_buffer->buffer[bytes_read - 1] = 0;
}
 
void
close_input_buffer(InputBuffer *input_buffer)
{
    free(input_buffer->buffer);
    free(input_buffer);
}