versions/v1_4_0/mynewt-core/encoding/tinycbor/src/cborparser_dup_string.c

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#define _BSD_SOURCE 1
#define _DEFAULT_SOURCE 1
#ifndef __STDC_LIMIT_MACROS
#  define __STDC_LIMIT_MACROS 1
#endif

#include "tinycbor/cbor.h"
#include <stdlib.h>

/**
 * \fn CborError cbor_value_dup_text_string(const CborValue *value, char **buffer, size_t *buflen, CborValue *next)
 *
 * Allocates memory for the string pointed by \a value and copies it into this
 * buffer. The pointer to the buffer is stored in \a buffer and the number of
 * bytes copied is stored in \a len (those variables must not be NULL).
 *
 * If the iterator \a value does not point to a text string, the behaviour is
 * undefined, so checking with \ref cbor_value_get_type or \ref
 * cbor_value_is_text_string is recommended.
 *
 * If \c malloc returns a NULL pointer, this function will return error
 * condition \ref CborErrorOutOfMemory.
 *
 * On success, \c{*buffer} will contain a valid pointer that must be freed by
 * calling \c{free()}. This is the case even for zero-length strings.
 *
 * The \a next pointer, if not null, will be updated to point to the next item
 * after this string. If \a value points to the last item, then \a next will be
 * invalid.
 *
 * This function may not run in constant time (it will run in O(n) time on the
 * number of chunks). It requires constant memory (O(1)) in addition to the
 * malloc'ed block.
 *
 * \note This function does not perform UTF-8 validation on the incoming text
 * string.
 *
 * \sa cbor_value_copy_text_string(), cbor_value_dup_byte_string()
 */

/**
 * \fn CborError cbor_value_dup_byte_string(const CborValue *value, uint8_t **buffer, size_t *buflen, CborValue *next)
 *
 * Allocates memory for the string pointed by \a value and copies it into this
 * buffer. The pointer to the buffer is stored in \a buffer and the number of
 * bytes copied is stored in \a len (those variables must not be NULL).
 *
 * If the iterator \a value does not point to a byte string, the behaviour is
 * undefined, so checking with \ref cbor_value_get_type or \ref
 * cbor_value_is_byte_string is recommended.
 *
 * If \c malloc returns a NULL pointer, this function will return error
 * condition \ref CborErrorOutOfMemory.
 *
 * On success, \c{*buffer} will contain a valid pointer that must be freed by
 * calling \c{free()}. This is the case even for zero-length strings.
 *
 * The \a next pointer, if not null, will be updated to point to the next item
 * after this string. If \a value points to the last item, then \a next will be
 * invalid.
 *
 * This function may not run in constant time (it will run in O(n) time on the
 * number of chunks). It requires constant memory (O(1)) in addition to the
 * malloc'ed block.
 *
 * \sa cbor_value_copy_byte_string(), cbor_value_dup_text_string()
 */
CborError _cbor_value_dup_string(const CborValue *value, void **buffer, size_t *buflen, CborValue *next)
{
    assert(buffer);
    assert(buflen);
    *buflen = SIZE_MAX;
    CborError err = _cbor_value_copy_string(value, NULL, buflen, NULL);
    if (err)
        return err;

    ++*buflen;
    *buffer = malloc(*buflen);
    if (!*buffer) {
        /* out of memory */
        return CborErrorOutOfMemory;
    }
    err = _cbor_value_copy_string(value, *buffer, buflen, next);
    if (err) {
        free(*buffer);
        return err;
    }
    return CborNoError;
}