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print_string_ptr: simplify code
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parent
88e38d042f
commit
0ca8587acc
97
cJSON.c
97
cJSON.c
@ -668,9 +668,9 @@ static unsigned char *print_string_ptr(const unsigned char * const input, printb
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const unsigned char *input_pointer = NULL;
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unsigned char *output = NULL;
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unsigned char *output_pointer = NULL;
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size_t length = 0;
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cjbool contains_special_char = false;
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unsigned char token = '\0';
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size_t output_length = 0;
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/* numbers of additional characters needed for escaping */
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size_t escape_characters = 0;
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if (output_buffer == NULL)
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{
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@ -680,7 +680,7 @@ static unsigned char *print_string_ptr(const unsigned char * const input, printb
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/* empty string */
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if (input == NULL)
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{
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output = ensure(output_buffer, 3);
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output = ensure(output_buffer, sizeof("\"\""));
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if (output == NULL)
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{
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return NULL;
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@ -693,102 +693,83 @@ static unsigned char *print_string_ptr(const unsigned char * const input, printb
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/* set "flag" to 1 if something needs to be escaped */
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for (input_pointer = input; *input_pointer; input_pointer++)
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{
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contains_special_char |= (((*input_pointer > 0) && (*input_pointer < 32)) /* unprintable characters */
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|| (*input_pointer == '\"') /* double quote */
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|| (*input_pointer == '\\')) /* backslash */
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? 1
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: 0;
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}
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/* no characters have to be escaped */
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if (!contains_special_char)
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if (strchr("\"\\\b\f\n\r\t", *input_pointer))
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{
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length = (size_t)(input_pointer - input);
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/* one character escape sequence */
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escape_characters++;
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}
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else if (*input_pointer < 32)
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{
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/* UTF-16 escape sequence uXXXX */
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escape_characters += 5;
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}
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}
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output_length = (size_t)(input_pointer - input) + escape_characters;
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output = ensure(output_buffer, length + 3);
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output = ensure(output_buffer, output_length + sizeof("\"\""));
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if (output == NULL)
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{
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return NULL;
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}
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output_pointer = output;
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*output_pointer++ = '\"';
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strcpy((char*)output_pointer, (const char*)input);
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output_pointer[length] = '\"';
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output_pointer[length + 1] = '\0';
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/* no characters have to be escaped */
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if (escape_characters == 0)
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{
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output[0] = '\"';
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memcpy(output + 1, input, output_length);
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output[output_length + 1] = '\"';
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output[output_length + 2] = '\0';
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return output;
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}
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input_pointer = input;
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/* calculate additional space that is needed for escaping */
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while ((token = *input_pointer))
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{
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++length;
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if (strchr("\"\\\b\f\n\r\t", token))
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{
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length++; /* +1 for the backslash */
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}
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else if (token < 32)
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{
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length += 5; /* +5 for \uXXXX */
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}
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input_pointer++;
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}
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output = ensure(output_buffer, length + 3);
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if (output == NULL)
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{
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return NULL;
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}
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output_pointer = output;
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input_pointer = input;
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*output_pointer++ = '\"';
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output[0] = '\"';
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output_pointer = output + 1;
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/* copy the string */
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while (*input_pointer)
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for (input_pointer = input; *input_pointer != '\0'; input_pointer++, output_pointer++)
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{
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if ((*input_pointer > 31) && (*input_pointer != '\"') && (*input_pointer != '\\'))
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{
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/* normal character, copy */
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*output_pointer++ = *input_pointer++;
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*output_pointer = *input_pointer;
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}
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else
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{
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/* character needs to be escaped */
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*output_pointer++ = '\\';
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switch (token = *input_pointer++)
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switch (*input_pointer)
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{
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case '\\':
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*output_pointer++ = '\\';
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*output_pointer = '\\';
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break;
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case '\"':
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*output_pointer++ = '\"';
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*output_pointer = '\"';
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break;
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case '\b':
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*output_pointer++ = 'b';
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*output_pointer = 'b';
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break;
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case '\f':
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*output_pointer++ = 'f';
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*output_pointer = 'f';
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break;
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case '\n':
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*output_pointer++ = 'n';
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*output_pointer = 'n';
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break;
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case '\r':
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*output_pointer++ = 'r';
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*output_pointer = 'r';
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break;
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case '\t':
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*output_pointer++ = 't';
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*output_pointer = 't';
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break;
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default:
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/* escape and print as unicode codepoint */
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sprintf((char*)output_pointer, "u%04x", token);
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output_pointer += 5;
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sprintf((char*)output_pointer, "u%04x", *input_pointer);
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output_pointer += 4;
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break;
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}
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}
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}
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*output_pointer++ = '\"';
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*output_pointer++ = '\0';
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output[output_length + 1] = '\"';
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output[output_length + 2] = '\0';
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return output;
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}
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