diff options
Diffstat (limited to 'vnfs/VES/code/evel_library/evel_json_buffer.c')
| -rw-r--r-- | vnfs/VES/code/evel_library/evel_json_buffer.c | 853 |
1 files changed, 853 insertions, 0 deletions
diff --git a/vnfs/VES/code/evel_library/evel_json_buffer.c b/vnfs/VES/code/evel_library/evel_json_buffer.c new file mode 100644 index 00000000..7ae3453b --- /dev/null +++ b/vnfs/VES/code/evel_library/evel_json_buffer.c @@ -0,0 +1,853 @@ +/**************************************************************************//** + * @file + * Source module relating to internal EVEL_JSON_BUFFER manipulation functions. + * + * License + * ------- + * + * Copyright(c) <2016>, AT&T Intellectual Property. All other rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: This product includes + * software developed by the AT&T. + * 4. Neither the name of AT&T nor the names of its contributors may be used to + * endorse or promote products derived from this software without specific + * prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY AT&T INTELLECTUAL PROPERTY ''AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL AT&T INTELLECTUAL PROPERTY BE LIABLE FOR ANY + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + *****************************************************************************/ + +#include <assert.h> +#include <string.h> + +#include "evel_throttle.h" + +/*****************************************************************************/ +/* Local prototypes. */ +/*****************************************************************************/ +static char * evel_json_kv_comma(EVEL_JSON_BUFFER * jbuf); + +/**************************************************************************//** + * Initialize a ::EVEL_JSON_BUFFER. + * + * @param jbuf Pointer to the ::EVEL_JSON_BUFFER to initialise. + * @param json Pointer to the underlying working buffer to use. + * @param max_size Size of storage available in the JSON buffer. + * @param throttle_spec Pointer to throttle specification. Can be NULL. + *****************************************************************************/ +void evel_json_buffer_init(EVEL_JSON_BUFFER * jbuf, + char * const json, + const int max_size, + EVEL_THROTTLE_SPEC * throttle_spec) +{ + EVEL_ENTER(); + + assert(jbuf != NULL); + assert(json != NULL); + jbuf->json = json; + jbuf->max_size = max_size; + jbuf->offset = 0; + jbuf->throttle_spec = throttle_spec; + jbuf->depth = 0; + jbuf->checkpoint = -1; + + EVEL_EXIT(); +} + +/**************************************************************************//** + * Encode an integer value to a JSON buffer. + * + * @param jbuf Pointer to working ::EVEL_JSON_BUFFER. + * @param value The integer to add to it. + *****************************************************************************/ +void evel_enc_int(EVEL_JSON_BUFFER * jbuf, + const int value) +{ + EVEL_ENTER(); + + /***************************************************************************/ + /* Check preconditions. */ + /***************************************************************************/ + assert(jbuf != NULL); + + jbuf->offset += snprintf(jbuf->json + jbuf->offset, + jbuf->max_size - jbuf->offset, + "%d", value); + + EVEL_EXIT(); +} + +/**************************************************************************//** + * Encode a string key and string value to a ::EVEL_JSON_BUFFER. + * + * @param jbuf Pointer to working ::EVEL_JSON_BUFFER. + * @param key Pointer to the key to encode. + * @param option Pointer to holder of the corresponding value to encode. + * @return true if the key, value was added, false if it was suppressed. + *****************************************************************************/ +bool evel_enc_kv_opt_string(EVEL_JSON_BUFFER * jbuf, + const char * const key, + const EVEL_OPTION_STRING * const option) +{ + bool added = false; + + EVEL_ENTER(); + + /***************************************************************************/ + /* Check preconditions. */ + /***************************************************************************/ + assert(option != NULL); + + if (option->is_set) + { + if ((jbuf->depth == EVEL_THROTTLE_FIELD_DEPTH) && + (jbuf->throttle_spec != NULL) && + evel_throttle_suppress_field(jbuf->throttle_spec, key)) + { + EVEL_INFO("Suppressed: %s, %s", key, option->value); + } + else + { + EVEL_DEBUG("Encoded: %s, %s", key, option->value); + evel_enc_kv_string(jbuf, key, option->value); + added = true; + } + } + + EVEL_EXIT(); + + return added; +} + +/**************************************************************************//** + * Encode a string key and string value to a ::EVEL_JSON_BUFFER. + * + * @param jbuf Pointer to working ::EVEL_JSON_BUFFER. + * @param key Pointer to the key to encode. + * @param value Pointer to the corresponding value to encode. + *****************************************************************************/ +void evel_enc_kv_string(EVEL_JSON_BUFFER * jbuf, + const char * const key, + const char * const value) +{ + int index; + int length; + + EVEL_ENTER(); + + /***************************************************************************/ + /* Check preconditions. */ + /***************************************************************************/ + assert(jbuf != NULL); + assert(key != NULL); + + jbuf->offset += snprintf(jbuf->json + jbuf->offset, + jbuf->max_size - jbuf->offset, + "%s\"%s\": \"", + evel_json_kv_comma(jbuf), + key); + + /***************************************************************************/ + /* We need to escape quotation marks and backslashes in the value. */ + /***************************************************************************/ + length = strlen(value); + + for (index = 0; index < length; index++) + { + /*************************************************************************/ + /* Drop out if no more space. */ + /*************************************************************************/ + if (jbuf->max_size - jbuf->offset < 2) + { + break; + } + + /*************************************************************************/ + /* Add an escape character if necessary, then write the character */ + /* itself. */ + /*************************************************************************/ + if ((value[index] == '\"') || (value[index] == '\\')) + { + jbuf->json[jbuf->offset] = '\\'; + jbuf->offset++; + } + + jbuf->json[jbuf->offset] = value[index]; + jbuf->offset++; + } + + jbuf->offset += snprintf(jbuf->json + jbuf->offset, + jbuf->max_size - jbuf->offset, + "\""); + + EVEL_EXIT(); +} + +/**************************************************************************//** + * Encode a string key and integer value to a ::EVEL_JSON_BUFFER. + * + * @param jbuf Pointer to working ::EVEL_JSON_BUFFER. + * @param key Pointer to the key to encode. + * @param option Pointer to holder of the corresponding value to encode. + * @return true if the key, value was added, false if it was suppressed. + *****************************************************************************/ +bool evel_enc_kv_opt_int(EVEL_JSON_BUFFER * jbuf, + const char * const key, + const EVEL_OPTION_INT * const option) +{ + bool added = false; + + EVEL_ENTER(); + + /***************************************************************************/ + /* Check preconditions. */ + /***************************************************************************/ + assert(option != NULL); + + if (option->is_set) + { + if ((jbuf->depth == EVEL_THROTTLE_FIELD_DEPTH) && + (jbuf->throttle_spec != NULL) && + evel_throttle_suppress_field(jbuf->throttle_spec, key)) + { + EVEL_INFO("Suppressed: %s, %d", key, option->value); + } + else + { + EVEL_DEBUG("Encoded: %s, %d", key, option->value); + evel_enc_kv_int(jbuf, key, option->value); + added = true; + } + } + + EVEL_EXIT(); + + return added; +} + +/**************************************************************************//** + * Encode a string key and integer value to a ::EVEL_JSON_BUFFER. + * + * @param jbuf Pointer to working ::EVEL_JSON_BUFFER. + * @param key Pointer to the key to encode. + * @param value The corresponding value to encode. + *****************************************************************************/ +void evel_enc_kv_int(EVEL_JSON_BUFFER * jbuf, + const char * const key, + const int value) +{ + EVEL_ENTER(); + + /***************************************************************************/ + /* Check preconditions. */ + /***************************************************************************/ + assert(jbuf != NULL); + assert(key != NULL); + + jbuf->offset += snprintf(jbuf->json + jbuf->offset, + jbuf->max_size - jbuf->offset, + "%s\"%s\": %d", + evel_json_kv_comma(jbuf), + key, + value); + + EVEL_EXIT(); +} + +/**************************************************************************//** + * Encode a string key and double value to a ::EVEL_JSON_BUFFER. + * + * @param jbuf Pointer to working ::EVEL_JSON_BUFFER. + * @param key Pointer to the key to encode. + * @param option Pointer to holder of the corresponding value to encode. + * @return true if the key, value was added, false if it was suppressed. + *****************************************************************************/ +bool evel_enc_kv_opt_double(EVEL_JSON_BUFFER * jbuf, + const char * const key, + const EVEL_OPTION_DOUBLE * const option) +{ + bool added = false; + + EVEL_ENTER(); + + /***************************************************************************/ + /* Check preconditions. */ + /***************************************************************************/ + assert(option != NULL); + + if (option->is_set) + { + if ((jbuf->depth == EVEL_THROTTLE_FIELD_DEPTH) && + (jbuf->throttle_spec != NULL) && + evel_throttle_suppress_field(jbuf->throttle_spec, key)) + { + EVEL_INFO("Suppressed: %s, %1f", key, option->value); + } + else + { + EVEL_DEBUG("Encoded: %s, %1f", key, option->value); + evel_enc_kv_double(jbuf, key, option->value); + added = true; + } + } + + EVEL_EXIT(); + + return added; +} + +/**************************************************************************//** + * Encode a string key and double value to a ::EVEL_JSON_BUFFER. + * + * @param jbuf Pointer to working ::EVEL_JSON_BUFFER. + * @param key Pointer to the key to encode. + * @param value The corresponding value to encode. + *****************************************************************************/ +void evel_enc_kv_double(EVEL_JSON_BUFFER * jbuf, + const char * const key, + const double value) +{ + EVEL_ENTER(); + + /***************************************************************************/ + /* Check preconditions. */ + /***************************************************************************/ + assert(jbuf != NULL); + assert(key != NULL); + + jbuf->offset += snprintf(jbuf->json + jbuf->offset, + jbuf->max_size - jbuf->offset, + "%s\"%s\": %1f", + evel_json_kv_comma(jbuf), + key, + value); + + EVEL_EXIT(); +} + +/**************************************************************************//** + * Encode a string key and unsigned long long value to a ::EVEL_JSON_BUFFER. + * + * @param jbuf Pointer to working ::EVEL_JSON_BUFFER. + * @param key Pointer to the key to encode. + * @param option Pointer to holder of the corresponding value to encode. + * @return true if the key, value was added, false if it was suppressed. + *****************************************************************************/ +bool evel_enc_kv_opt_ull(EVEL_JSON_BUFFER * jbuf, + const char * const key, + const EVEL_OPTION_ULL * const option) +{ + bool added = false; + + EVEL_ENTER(); + + /***************************************************************************/ + /* Check preconditions. */ + /***************************************************************************/ + assert(option != NULL); + + if (option->is_set) + { + if ((jbuf->depth == EVEL_THROTTLE_FIELD_DEPTH) && + (jbuf->throttle_spec != NULL) && + evel_throttle_suppress_field(jbuf->throttle_spec, key)) + { + EVEL_INFO("Suppressed: %s, %1lu", key, option->value); + } + else + { + EVEL_DEBUG("Encoded: %s, %1lu", key, option->value); + evel_enc_kv_ull(jbuf, key, option->value); + added = true; + } + } + + EVEL_EXIT(); + + return added; +} + +/**************************************************************************//** + * Encode a string key and unsigned long long value to a ::EVEL_JSON_BUFFER. + * + * @param jbuf Pointer to working ::EVEL_JSON_BUFFER. + * @param key Pointer to the key to encode. + * @param value The corresponding value to encode. + *****************************************************************************/ +void evel_enc_kv_ull(EVEL_JSON_BUFFER * jbuf, + const char * const key, + const unsigned long long value) +{ + EVEL_ENTER(); + + /***************************************************************************/ + /* Check preconditions. */ + /***************************************************************************/ + assert(jbuf != NULL); + assert(key != NULL); + + jbuf->offset += snprintf(jbuf->json + jbuf->offset, + jbuf->max_size - jbuf->offset, + "%s\"%s\": %llu", + evel_json_kv_comma(jbuf), + key, + value); + + EVEL_EXIT(); +} + +/**************************************************************************//** + * Encode a string key and time value to a ::EVEL_JSON_BUFFER. + * + * @param jbuf Pointer to working ::EVEL_JSON_BUFFER. + * @param key Pointer to the key to encode. + * @param option Pointer to holder of the corresponding value to encode. + * @return true if the key, value was added, false if it was suppressed. + *****************************************************************************/ +bool evel_enc_kv_opt_time(EVEL_JSON_BUFFER * jbuf, + const char * const key, + const EVEL_OPTION_TIME * const option) +{ + bool added = false; + + EVEL_ENTER(); + + /***************************************************************************/ + /* Check preconditions. */ + /***************************************************************************/ + assert(option != NULL); + + if (option->is_set) + { + if ((jbuf->depth == EVEL_THROTTLE_FIELD_DEPTH) && + (jbuf->throttle_spec != NULL) && + evel_throttle_suppress_field(jbuf->throttle_spec, key)) + { + EVEL_INFO("Suppressed time: %s", key); + } + else + { + EVEL_DEBUG("Encoded time: %s", key); + evel_enc_kv_time(jbuf, key, &option->value); + added = true; + } + } + + EVEL_EXIT(); + + return added; +} + +/**************************************************************************//** + * Encode a string key and time value to a ::EVEL_JSON_BUFFER. + * + * @param jbuf Pointer to working ::EVEL_JSON_BUFFER. + * @param key Pointer to the key to encode. + * @param time Pointer to the time to encode. + *****************************************************************************/ +void evel_enc_kv_time(EVEL_JSON_BUFFER * jbuf, + const char * const key, + const time_t * time) +{ + EVEL_ENTER(); + + /***************************************************************************/ + /* Check preconditions. */ + /***************************************************************************/ + assert(jbuf != NULL); + assert(key != NULL); + assert(time != NULL); + + jbuf->offset += snprintf(jbuf->json + jbuf->offset, + jbuf->max_size - jbuf->offset, + "%s\"%s\": \"", + evel_json_kv_comma(jbuf), + key); + jbuf->offset += strftime(jbuf->json + jbuf->offset, + jbuf->max_size - jbuf->offset, + EVEL_RFC2822_STRFTIME_FORMAT, + localtime(time)); + jbuf->offset += snprintf(jbuf->json + jbuf->offset, + jbuf->max_size - jbuf->offset, + "\""); + EVEL_EXIT(); +} + +/**************************************************************************//** + * Encode a key and version. + * + * @param jbuf Pointer to working ::EVEL_JSON_BUFFER. + * @param key Pointer to the key to encode. + * @param major_version The major version to encode. + * @param minor_version The minor version to encode. + *****************************************************************************/ +void evel_enc_version(EVEL_JSON_BUFFER * jbuf, + const char * const key, + const int major_version, + const int minor_version) +{ + EVEL_ENTER(); + + /***************************************************************************/ + /* Check preconditions. */ + /***************************************************************************/ + assert(jbuf != NULL); + assert(key != NULL); + + evel_enc_kv_int(jbuf, key, major_version); + if (minor_version != 0) + { + jbuf->offset += snprintf(jbuf->json + jbuf->offset, + jbuf->max_size - jbuf->offset, + ".%d", + minor_version); + } + + EVEL_EXIT(); +} + +/**************************************************************************//** + * Add the key and opening bracket of an optional named list to a JSON buffer. + * + * @param jbuf Pointer to working ::EVEL_JSON_BUFFER. + * @param key Pointer to the key to encode. + * @return true if the list was opened, false if it was suppressed. + *****************************************************************************/ +bool evel_json_open_opt_named_list(EVEL_JSON_BUFFER * jbuf, + const char * const key) +{ + bool opened = false; + + EVEL_ENTER(); + + /***************************************************************************/ + /* Check preconditions. */ + /***************************************************************************/ + assert(jbuf != NULL); + assert(key != NULL); + + if ((jbuf->depth == EVEL_THROTTLE_FIELD_DEPTH) && + (jbuf->throttle_spec != NULL) && + evel_throttle_suppress_field(jbuf->throttle_spec, key)) + { + EVEL_INFO("Suppressed: %s", key); + opened = false; + } + else + { + evel_json_open_named_list(jbuf, key); + opened = true; + } + + EVEL_EXIT(); + + return opened; +} + +/**************************************************************************//** + * Add the key and opening bracket of a named list to a JSON buffer. + * + * @param jbuf Pointer to working ::EVEL_JSON_BUFFER. + * @param key Pointer to the key to encode. + *****************************************************************************/ +void evel_json_open_named_list(EVEL_JSON_BUFFER * jbuf, + const char * const key) +{ + EVEL_ENTER(); + + /***************************************************************************/ + /* Check preconditions. */ + /***************************************************************************/ + assert(jbuf != NULL); + assert(key != NULL); + + jbuf->offset += snprintf(jbuf->json + jbuf->offset, + jbuf->max_size - jbuf->offset, + "%s\"%s\": [", + evel_json_kv_comma(jbuf), + key); + jbuf->depth++; + + EVEL_EXIT(); +} + +/**************************************************************************//** + * Add the closing bracket of a list to a JSON buffer. + * + * @param jbuf Pointer to working ::EVEL_JSON_BUFFER. + *****************************************************************************/ +void evel_json_close_list(EVEL_JSON_BUFFER * jbuf) +{ + EVEL_ENTER(); + + /***************************************************************************/ + /* Check preconditions. */ + /***************************************************************************/ + assert(jbuf != NULL); + + jbuf->offset += snprintf(jbuf->json + jbuf->offset, + jbuf->max_size - jbuf->offset, + "]"); + jbuf->depth--; + + EVEL_EXIT(); +} + +/**************************************************************************//** + * Encode a list item with format and param list to a ::EVEL_JSON_BUFFER. + * + * @param jbuf Pointer to working ::EVEL_JSON_BUFFER. + * @param format Format string in standard printf format. + * @param ... Variable parameters for format string. + *****************************************************************************/ +void evel_enc_list_item(EVEL_JSON_BUFFER * jbuf, + const char * const format, + ...) +{ + va_list largs; + + EVEL_ENTER(); + + /***************************************************************************/ + /* Check preconditions. */ + /***************************************************************************/ + assert(jbuf != NULL); + assert(format != NULL); + + /***************************************************************************/ + /* Add a comma unless we're at the start of the list. */ + /***************************************************************************/ + if (jbuf->json[jbuf->offset - 1] != '[') + { + jbuf->offset += snprintf(jbuf->json + jbuf->offset, + jbuf->max_size - jbuf->offset, + ", "); + } + + va_start(largs, format); + jbuf->offset += vsnprintf(jbuf->json + jbuf->offset, + jbuf->max_size - jbuf->offset, + format, + largs); + va_end(largs); + + EVEL_EXIT(); +} + +/**************************************************************************//** + * Add the opening bracket of an optional named object to a JSON buffer. + * + * @param jbuf Pointer to working ::EVEL_JSON_BUFFER. + * @param key Pointer to the key to encode. + *****************************************************************************/ +bool evel_json_open_opt_named_object(EVEL_JSON_BUFFER * jbuf, + const char * const key) +{ + bool opened = false; + + EVEL_ENTER(); + + /***************************************************************************/ + /* Check preconditions. */ + /***************************************************************************/ + assert(jbuf != NULL); + assert(key != NULL); + + if ((jbuf->depth == EVEL_THROTTLE_FIELD_DEPTH) && + (jbuf->throttle_spec != NULL) && + evel_throttle_suppress_field(jbuf->throttle_spec, key)) + { + EVEL_INFO("Suppressed: %s", key); + opened = false; + } + else + { + evel_json_open_named_object(jbuf, key); + opened = true; + } + + EVEL_EXIT(); + + return opened; +} + +/**************************************************************************//** + * Add the opening bracket of an object to a JSON buffer. + * + * @param jbuf Pointer to working ::EVEL_JSON_BUFFER. + * @param key Pointer to the key to encode. + * @return true if the object was opened, false if it was suppressed. + *****************************************************************************/ +void evel_json_open_named_object(EVEL_JSON_BUFFER * jbuf, + const char * const key) +{ + EVEL_ENTER(); + + /***************************************************************************/ + /* Check preconditions. */ + /***************************************************************************/ + assert(jbuf != NULL); + assert(key != NULL); + + jbuf->offset += snprintf(jbuf->json + jbuf->offset, + jbuf->max_size - jbuf->offset, + "%s\"%s\": {", + evel_json_kv_comma(jbuf), + key); + jbuf->depth++; + + EVEL_EXIT(); +} + +/**************************************************************************//** + * Add the opening bracket of an object to a JSON buffer. + * + * @param jbuf Pointer to working ::EVEL_JSON_BUFFER. + *****************************************************************************/ +void evel_json_open_object(EVEL_JSON_BUFFER * jbuf) +{ + char * comma; + + EVEL_ENTER(); + + /***************************************************************************/ + /* Check preconditions. */ + /***************************************************************************/ + assert(jbuf != NULL); + + if ((jbuf->offset != 0) && (jbuf->json[jbuf->offset-1] == '}')) + { + comma = ", "; + } + else + { + comma = ""; + } + + jbuf->offset += snprintf(jbuf->json + jbuf->offset, + jbuf->max_size - jbuf->offset, + "%s{", + comma); + jbuf->depth++; + + EVEL_EXIT(); +} + +/**************************************************************************//** + * Add the closing bracket of an object to a JSON buffer. + * + * @param jbuf Pointer to working ::EVEL_JSON_BUFFER. + *****************************************************************************/ +void evel_json_close_object(EVEL_JSON_BUFFER * jbuf) +{ + EVEL_ENTER(); + + /***************************************************************************/ + /* Check preconditions. */ + /***************************************************************************/ + assert(jbuf != NULL); + + jbuf->offset += snprintf(jbuf->json + jbuf->offset, + jbuf->max_size - jbuf->offset, + "}"); + jbuf->depth--; + + EVEL_EXIT(); +} + +/**************************************************************************//** + * Determine whether to add a comma when adding a key-value pair. + * + * @param jbuf Pointer to working ::EVEL_JSON_BUFFER. + * @returns A string containing the comma if it is required. + *****************************************************************************/ +char * evel_json_kv_comma(EVEL_JSON_BUFFER * jbuf) +{ + char * result; + + EVEL_ENTER(); + + /***************************************************************************/ + /* Check preconditions. */ + /***************************************************************************/ + assert(jbuf != NULL); + + if ((jbuf->offset == 0) || + (jbuf->json[jbuf->offset-1] == '{') || + (jbuf->json[jbuf->offset-1] == '[')) + { + result = ""; + } + else + { + result = ", "; + } + + EVEL_EXIT(); + + return result; +} + +/**************************************************************************//** + * Add a checkpoint - a stake in the ground to which we can rewind. + * + * @param jbuf Pointer to working ::EVEL_JSON_BUFFER. + *****************************************************************************/ +void evel_json_checkpoint(EVEL_JSON_BUFFER * jbuf) +{ + EVEL_ENTER(); + + /***************************************************************************/ + /* Check preconditions. */ + /***************************************************************************/ + assert(jbuf != NULL); + + /***************************************************************************/ + /* Store the current offset. */ + /***************************************************************************/ + jbuf->checkpoint = jbuf->offset; + + EVEL_EXIT(); +} + +/**************************************************************************//** + * Rewind to the latest checkoint. + * + * @param jbuf Pointer to working ::EVEL_JSON_BUFFER. + *****************************************************************************/ +void evel_json_rewind(EVEL_JSON_BUFFER * jbuf) +{ + EVEL_ENTER(); + + /***************************************************************************/ + /* Check preconditions. */ + /***************************************************************************/ + assert(jbuf != NULL); + assert(jbuf->checkpoint >= 0); + assert(jbuf->checkpoint <= jbuf->offset); + + /***************************************************************************/ + /* Reinstate the offset from the last checkpoint. */ + /***************************************************************************/ + jbuf->offset = jbuf->checkpoint; + jbuf->checkpoint = -1; + + EVEL_EXIT(); +} |