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Fixed snprintf() return value handling.
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690e03a8a7
commit
0a4c77dbff
@ -301,13 +301,14 @@ coap_set_rest_status(void *packet, unsigned int code)
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/*-----------------------------------------------------------------------------------*/
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/*- Server part ---------------------------------------------------------------------*/
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/*-----------------------------------------------------------------------------------*/
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/* The discover resource is automatically included for CoAP. */
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RESOURCE(well_known_core, METHOD_GET, ".well-known/core", "ct=40");
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void
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well_known_core_handler(void* request, void* response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
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{
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size_t strpos = 0;
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size_t bufpos = 0;
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size_t strpos = 0; /* position in overall string (which is larger than the buffer) */
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size_t bufpos = 0; /* position within buffer (bytes written) */
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size_t tmplen = 0;
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resource_t* resource = NULL;
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@ -333,6 +334,10 @@ well_known_core_handler(void* request, void* response, uint8_t *buffer, uint16_t
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bufpos += snprintf((char *) buffer + bufpos, preferred_size - bufpos + 1,
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"%s", resource->url + ((*offset-(int32_t)strpos > 0) ? (*offset-(int32_t)strpos) : 0));
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/* minimal-net requires these casts */
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if (bufpos >= preferred_size)
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{
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break;
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}
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}
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strpos += tmplen;
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@ -355,6 +360,10 @@ well_known_core_handler(void* request, void* response, uint8_t *buffer, uint16_t
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{
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bufpos += snprintf((char *) buffer + bufpos, preferred_size - bufpos + 1,
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"%s", resource->attributes + (*offset-(int32_t)strpos > 0 ? *offset-(int32_t)strpos : 0));
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if (bufpos >= preferred_size)
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{
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break;
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}
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}
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strpos += tmplen;
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}
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@ -397,7 +406,7 @@ well_known_core_handler(void* request, void* response, uint8_t *buffer, uint16_t
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else
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{
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PRINTF("res: MORE at %s (%p)\n", resource->url, resource);
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*offset += bufpos;
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*offset += preferred_size;
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}
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}
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/*-----------------------------------------------------------------------------------*/
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@ -45,14 +45,14 @@
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/* Define which resources to include to meet memory constraints. */
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#define REST_RES_HELLO 1
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#define REST_RES_MIRROR 0
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#define REST_RES_MIRROR 0 /* causes largest code size */
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#define REST_RES_CHUNKS 1
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#define REST_RES_POLLING 0
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#define REST_RES_POLLING 1
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#define REST_RES_EVENT 1
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#define REST_RES_LEDS 0
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#define REST_RES_LEDS 1
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#define REST_RES_TOGGLE 1
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#define REST_RES_LIGHT 1
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#define REST_RES_BATTERY 0
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#define REST_RES_BATTERY 1
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@ -173,28 +173,29 @@ mirror_handler(void* request, void* response, uint8_t *buffer, uint16_t preferre
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int strpos = 0;
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/* snprintf() counts the terminating '\0' to the size parameter.
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* Add +1 to fill the complete buffer.
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* The additional byte is taken care of by allocating REST_MAX_CHUNK_SIZE+1 bytes in the REST framework. */
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* The additional byte is taken care of by allocating REST_MAX_CHUNK_SIZE+1 bytes in the REST framework.
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* Add +1 to fill the complete buffer. */
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strpos += snprintf((char *)buffer, REST_MAX_CHUNK_SIZE+1, "CT %u\n", content_type);
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/* Some getters such as for ETag or Location are omitted, as these options should not appear in a request.
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* Max-Age might appear in HTTP requests or used for special purposes in CoAP. */
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if (REST.get_header_max_age(request, &max_age))
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if (strpos<=REST_MAX_CHUNK_SIZE && REST.get_header_max_age(request, &max_age))
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{
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strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "MA %lu\n", max_age);
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}
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if ((len = REST.get_header_host(request, &str)))
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if (strpos<=REST_MAX_CHUNK_SIZE && (len = REST.get_header_host(request, &str)))
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{
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strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "UH %.*s\n", len, str);
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}
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/* CoAP-specific example: actions not required for normal RESTful Web service. */
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#if WITH_COAP > 1
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if (coap_get_header_observe(request, &observe))
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if (strpos<=REST_MAX_CHUNK_SIZE && coap_get_header_observe(request, &observe))
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{
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strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "Ob %lu\n", observe);
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}
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if ((len = coap_get_header_token(request, &bytes)))
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if (strpos<=REST_MAX_CHUNK_SIZE && (len = coap_get_header_token(request, &bytes)))
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{
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strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "To 0x");
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int index = 0;
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@ -203,7 +204,7 @@ mirror_handler(void* request, void* response, uint8_t *buffer, uint16_t preferre
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}
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strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "\n");
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}
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if ((len = coap_get_header_etag(request, &bytes)))
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if (strpos<=REST_MAX_CHUNK_SIZE && (len = coap_get_header_etag(request, &bytes)))
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{
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strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "ET 0x");
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int index = 0;
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@ -212,34 +213,34 @@ mirror_handler(void* request, void* response, uint8_t *buffer, uint16_t preferre
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}
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strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "\n");
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}
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if ((len = coap_get_header_uri_path(request, &str)))
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if (strpos<=REST_MAX_CHUNK_SIZE && (len = coap_get_header_uri_path(request, &str)))
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{
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strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "UP ");
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strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "%.*s\n", len, str);
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}
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#if WITH_COAP == 3
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if ((len = coap_get_header_location(request, &str)))
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if (strpos<=REST_MAX_CHUNK_SIZE && (len = coap_get_header_location(request, &str)))
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{
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strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "Lo %.*s\n", len, str);
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}
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if (coap_get_header_block(request, &block_num, &block_more, &block_size, NULL)) /* This getter allows NULL pointers to get only a subset of the block parameters. */
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if (strpos<=REST_MAX_CHUNK_SIZE && coap_get_header_block(request, &block_num, &block_more, &block_size, NULL)) /* This getter allows NULL pointers to get only a subset of the block parameters. */
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{
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strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "Bl %lu%s (%u)\n", block_num, block_more ? "+" : "", block_size);
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}
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#elif WITH_COAP >= 5
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if ((len = coap_get_header_location_path(request, &str)))
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if (strpos<=REST_MAX_CHUNK_SIZE && (len = coap_get_header_location_path(request, &str)))
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{
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strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "LP %.*s\n", len, str);
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}
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if ((len = coap_get_header_location_query(request, &str)))
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if (strpos<=REST_MAX_CHUNK_SIZE && (len = coap_get_header_location_query(request, &str)))
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{
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strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "LQ %.*s\n", len, str);
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}
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if (coap_get_header_block2(request, &block_num, &block_more, &block_size, NULL)) /* This getter allows NULL pointers to get only a subset of the block parameters. */
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if (strpos<=REST_MAX_CHUNK_SIZE && coap_get_header_block2(request, &block_num, &block_more, &block_size, NULL)) /* This getter allows NULL pointers to get only a subset of the block parameters. */
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{
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strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "B2 %lu%s (%u)\n", block_num, block_more ? "+" : "", block_size);
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}
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if (coap_get_header_block1(request, &block_num, &block_more, &block_size, NULL)) /* This getter allows NULL pointers to get only a subset of the block parameters. */
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if (strpos<=REST_MAX_CHUNK_SIZE && coap_get_header_block1(request, &block_num, &block_more, &block_size, NULL)) /* This getter allows NULL pointers to get only a subset of the block parameters. */
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{
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strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "B1 %lu%s (%u)\n", block_num, block_more ? "+" : "", block_size);
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}
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@ -250,16 +251,16 @@ mirror_handler(void* request, void* response, uint8_t *buffer, uint16_t preferre
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#endif
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#endif /* CoAP-specific example */
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if ((len = REST.get_query(request, &query)))
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if (strpos<=REST_MAX_CHUNK_SIZE && (len = REST.get_query(request, &query)))
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{
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strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "Qu %.*s\n", len, query);
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}
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if ((len = REST.get_request_payload(request, &bytes)))
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if (strpos<=REST_MAX_CHUNK_SIZE && (len = REST.get_request_payload(request, &bytes)))
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{
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strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "%.*s", len, bytes);
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}
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if (strpos == REST_MAX_CHUNK_SIZE)
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if (strpos >= REST_MAX_CHUNK_SIZE)
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{
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buffer[REST_MAX_CHUNK_SIZE-1] = 0xBB; /* '»' to indicate truncation */
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}
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@ -332,7 +333,7 @@ chunks_handler(void* request, void* response, uint8_t *buffer, uint16_t preferre
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strpos = preferred_size;
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}
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/* Truncate if above total size. */
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/* Truncate if above CHUNKS_TOTAL bytes. */
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if (*offset+(int32_t)strpos > CHUNKS_TOTAL)
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{
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strpos = CHUNKS_TOTAL - *offset;
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