145 lines
4.0 KiB
C
145 lines
4.0 KiB
C
/****************************************************************************
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** GeomIO Library
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** Copyright FougSys (2 Mar. 2015)
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** contact@fougsys.fr
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**
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** This software is a reusable library whose purpose is to provide complete
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** I/O support for various CAD file formats (eg. STL)
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**
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** This software is governed by the CeCILL-B license under French law and
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** abiding by the rules of distribution of free software. You can use,
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** modify and/ or redistribute the software under the terms of the CeCILL-B
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** license as circulated by CEA, CNRS and INRIA at the following URL
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** "http://www.cecill.info".
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****************************************************************************/
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#include "string_parse.h"
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#include "helper_stream.h"
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#include <ctype.h>
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#include <errno.h>
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#include <stdlib.h>
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void gmio_string_stream_fwd_iterator_init(gmio_string_stream_fwd_iterator_t *it)
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{
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/* Trick: declaring the buffer exhausted will actually trigger the first
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* call to gmio_stream_read() inside gmio_next_char()
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*/
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it->buffer.len = 0;
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it->buffer_pos = it->buffer.max_len;
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gmio_next_char(it);
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}
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const char *gmio_current_char(const gmio_string_stream_fwd_iterator_t *it)
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{
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if (it != NULL && it->buffer_pos < it->buffer.len)
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return it->buffer.ptr + it->buffer_pos;
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return NULL;
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}
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const char *gmio_next_char(gmio_string_stream_fwd_iterator_t *it)
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{
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if (it == NULL)
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return NULL;
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if ((it->buffer_pos + 1) < it->buffer.len) {
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++(it->buffer_pos);
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return it->buffer.ptr + it->buffer_pos;
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}
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else {
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if (gmio_stream_error(it->stream) != 0
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|| gmio_stream_at_end(it->stream))
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{
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return NULL;
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}
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/* Read next chunk of data */
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it->buffer_pos = 0;
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it->buffer.len = gmio_stream_read(it->stream,
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it->buffer.ptr,
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sizeof(char), it->buffer.max_len);
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if (gmio_stream_error(it->stream) == 0) {
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if (it->stream_read_hook != NULL)
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it->stream_read_hook(it->cookie, &it->buffer);
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return it->buffer.ptr;
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}
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}
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return NULL;
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}
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void gmio_skip_spaces(gmio_string_stream_fwd_iterator_t *it)
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{
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const char* curr_char = gmio_current_char(it);
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while (curr_char != NULL && isspace(*curr_char))
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curr_char = gmio_next_char(it);
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}
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int gmio_eat_word(
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gmio_string_stream_fwd_iterator_t *it, gmio_string_buffer_t *buffer)
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{
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const char* stream_curr_char = NULL;
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int isspace_res = 0;
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size_t i = 0;
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if (buffer == NULL || buffer->ptr == NULL)
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return -1;
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buffer->len = 0;
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gmio_skip_spaces(it);
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stream_curr_char = gmio_current_char(it);
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while (i < buffer->max_len
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&& stream_curr_char != NULL
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&& isspace_res == 0)
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{
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isspace_res = isspace(*stream_curr_char);
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if (isspace_res == 0) {
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buffer->ptr[i] = *stream_curr_char;
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stream_curr_char = gmio_next_char(it);
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++i;
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}
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}
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if (i < buffer->max_len) {
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buffer->ptr[i] = 0; /* End string with terminating null byte */
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buffer->len = i;
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if (stream_curr_char != NULL || gmio_stream_at_end(it->stream))
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return 0;
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return -2;
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}
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return -3;
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}
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int gmio_get_float32(const char *str, gmio_float32_t *value_ptr)
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{
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char* end_ptr; /* for strtod() */
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#ifdef GMIO_HAVE_STRTOF_FUNC
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*value_ptr = strtof(str, &end_ptr); /* Requires C99 */
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#else
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*value_ptr = (gmio_float32_t)strtod(str, &end_ptr);
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#endif
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if (end_ptr == str || errno == ERANGE)
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return -1;
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return 0;
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}
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gmio_bool_t gmio_checked_next_chars(
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gmio_string_stream_fwd_iterator_t *it, const char *str)
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{
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size_t pos = 0;
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const char* curr_char = gmio_current_char(it);
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gmio_bool_t same = curr_char != NULL && *curr_char == *str;
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while (same) {
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curr_char = gmio_next_char(it);
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same = curr_char != NULL && *curr_char == str[++pos];
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}
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return same;
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}
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