Azure IoT common library
Dependents: STM32F746_iothub_client_sample_mqtt f767zi_mqtt iothub_client_sample_amqp iothub_client_sample_http ... more
Diff: httpapi_compact.c
- Revision:
- 7:1af47e3a19b6
- Parent:
- 6:c55b013dfc2a
- Child:
- 11:77df6d7e65ae
--- a/httpapi_compact.c Fri Jul 01 10:43:23 2016 -0700 +++ b/httpapi_compact.c Fri Jul 29 16:01:07 2016 -0700 @@ -18,6 +18,7 @@ #include "azure_c_shared_utility/tlsio.h" #include "azure_c_shared_utility/threadapi.h" #include <string.h> +#include <limits.h> #define MAX_HOSTNAME 64 #define TEMP_BUFFER_SIZE 4096 @@ -46,6 +47,68 @@ unsigned int is_connected : 1; } HTTP_HANDLE_DATA; +/*the following function does the same as sscanf(pos2, "%d", &sec)*/ +/*this function only exists because some of platforms do not have sscanf. */ +static int ParseStringToDecimal(const char *src, int* dst) +{ + char* next; + (*dst) = strtol(src, &next, 0); + if ((src == next) || ((((*dst) == LONG_MAX) || ((*dst) == LONG_MIN)) && (errno != 0))) + { + return EOF; + } + return 1; +} + +/*the following function does the same as sscanf(pos2, "%x", &sec)*/ +/*this function only exists because some of platforms do not have sscanf. This is not a full implementation; it only works with well-defined x numbers. */ +#define HEXA_DIGIT_VAL(c) (((c>='0') && (c<='9')) ? (c-'0') : ((c>='a') && (c<='f')) ? (c-'a'+10) : ((c>='A') && (c<='F')) ? (c-'A'+10) : -1) +static int ParseStringToHexadecimal(const char *src, int* dst) +{ + if (src == NULL) + return EOF; + if (HEXA_DIGIT_VAL(*src) == -1) + return EOF; + + int digitVal; + (*dst) = 0; + while ((digitVal = HEXA_DIGIT_VAL(*src)) != -1) + { + (*dst) *= 0x10; + (*dst) += digitVal; + src++; + } + return 1; +} + +/*the following function does the same as sscanf(buf, "HTTP/%*d.%*d %d %*[^\r\n]", &ret) */ +/*this function only exists because some of platforms do not have sscanf. This is not a full implementation; it only works with well-defined HTTP response. */ +static int ParseHttpResponse(const char* src, int* dst) +{ + const char* prefix = "HTTP/"; + while ((*prefix) != '\0') + { + if ((*prefix) != (*src)) + return EOF; + prefix++; + src++; + } + + while ((*src) != '.') + { + if ((*src) == '\0') + return EOF; + } + + while ((*src) != ' ') + { + if ((*src) == '\0') + return EOF; + } + + return ParseStringToDecimal(src, dst); +} + HTTPAPI_RESULT HTTPAPI_Init(void) { return HTTPAPI_OK; @@ -529,7 +592,7 @@ } //Parse HTTP response - if (sscanf(buf, "HTTP/%*d.%*d %d %*[^\r\n]", &ret) != 1) + if (ParseHttpResponse(buf, &ret) != 1) { //Cannot match string, error LogInfo("HTTPAPI_ExecuteRequest::Not a correct HTTP answer=%s", buf); @@ -555,7 +618,7 @@ if (my_strnicmp(buf, ContentLength, CHAR_COUNT(ContentLength)) == 0) { - if (sscanf(buf + CHAR_COUNT(ContentLength), " %d", &bodyLength) != 1) + if (ParseStringToDecimal(buf + CHAR_COUNT(ContentLength), &bodyLength) != 1) { result = HTTPAPI_READ_DATA_FAILED; LogError("(result = %s)", ENUM_TO_STRING(HTTPAPI_RESULT, result)); @@ -640,7 +703,7 @@ LogError("(result = %s)", ENUM_TO_STRING(HTTPAPI_RESULT, result)); goto exit; } - if (sscanf(buf, "%x", &chunkSize) != 1) // chunkSize is length of next line (/r/n is not counted) + if (ParseStringToHexadecimal(buf, &chunkSize) != 1) // chunkSize is length of next line (/r/n is not counted) { //Cannot match string, error result = HTTPAPI_RECEIVE_RESPONSE_FAILED;