Implemented support for new instruction format (inbound), simplified instruction parsing.
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197029c3d8
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@ -86,6 +86,11 @@ typedef struct GUACIO {
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*/
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char out_buf[8192];
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/**
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* The current location of parsing within the instruction buffer.
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*/
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int instructionbuf_parse_start;
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/**
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* The current size of the instruction buffer.
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*/
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@ -103,6 +108,17 @@ typedef struct GUACIO {
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*/
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char* instructionbuf;
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/**
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* The number of elements parsed so far.
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*/
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int instructionbuf_elementc;
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/**
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* Array of pointers into the instruction buffer, where each pointer
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* points to the start of the corresponding element.
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*/
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char* instructionbuf_elementv[64];
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} GUACIO;
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/**
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@ -73,6 +73,8 @@ GUACIO* guac_open(int fd) {
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io->instructionbuf_size = 1024;
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io->instructionbuf = malloc(io->instructionbuf_size);
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io->instructionbuf_used_length = 0;
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io->instructionbuf_parse_start = 0;
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io->instructionbuf_elementc = 0;
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return io;
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@ -359,62 +359,83 @@ int __guac_fill_instructionbuf(GUACIO* io) {
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int guac_read_instruction(GUACIO* io, guac_instruction* parsed_instruction) {
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int retval;
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int i = 0;
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int argcount = 0;
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int j;
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int current_arg = 0;
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int i = io->instructionbuf_parse_start;
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/* Loop until a instruction is read */
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for (;;) {
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/* Search for end of instruction */
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for (; i < io->instructionbuf_used_length; i++) {
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/* Length of element */
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int element_length = 0;
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/* Count arguments as we look for the end */
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if (io->instructionbuf[i] == ',')
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argcount++;
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else if (io->instructionbuf[i] == ':' && argcount == 0)
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argcount++;
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/* Parse instruction in buffe */
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while (i < io->instructionbuf_used_length) {
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/* End found ... */
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else if (io->instructionbuf[i] == ';') {
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/* Read character from buffer */
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char c = io->instructionbuf[i++];
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/* Parse new instruction */
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char* instruction = malloc(i+1);
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memcpy(instruction, io->instructionbuf, i+1);
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instruction[i] = '\0'; /* Replace semicolon with null terminator. */
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/* If digit, calculate element length */
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if (c >= '0' && c <= '9')
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element_length = element_length * 10 + c - '0';
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parsed_instruction->opcode = NULL;
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/* Otherwise, if end of length */
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else if (c == '.') {
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parsed_instruction->argc = argcount;
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parsed_instruction->argv = malloc(sizeof(char*) * argcount);
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/* Verify element is fully read */
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if (i + element_length < io->instructionbuf_used_length) {
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for (j=0; j<i; j++) {
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/* Get element value */
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char* elementv = &(io->instructionbuf[i]);
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/* If encountered a colon, and no opcode parsed yet, set opcode and following argument */
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if (instruction[j] == ':' && parsed_instruction->opcode == NULL) {
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instruction[j] = '\0';
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parsed_instruction->argv[current_arg++] = &(instruction[j+1]);
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parsed_instruction->opcode = instruction;
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}
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/* Get terminator, set null terminator of elementv */
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char terminator = elementv[element_length];
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elementv[element_length] = '\0';
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/* If encountered a comma, set following argument */
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else if (instruction[j] == ',') {
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instruction[j] = '\0';
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parsed_instruction->argv[current_arg++] = &(instruction[j+1]);
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}
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}
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/* Move to terminator of element */
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i += element_length;
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/* If no arguments, set opcode to entire instruction */
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if (parsed_instruction->opcode == NULL)
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parsed_instruction->opcode = instruction;
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/* Reset element length */
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element_length = 0;
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/* Found. Reset buffer */
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memmove(io->instructionbuf, io->instructionbuf + i + 1, io->instructionbuf_used_length - i - 1);
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io->instructionbuf_used_length -= i + 1;
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/* As element has been read successfully, update
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* parse start */
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io->instructionbuf_parse_start = i;
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/* Save element */
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io->instructionbuf_elementv[io->instructionbuf_elementc++] = elementv;
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/* Finish parse if terminator is a semicolon */
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if (terminator == ';') {
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int j;
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/* Init parsed instruction */
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parsed_instruction->argc = io->instructionbuf_elementc - 1;
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parsed_instruction->argv = malloc(sizeof(char*) * parsed_instruction->argc);
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/* Set opcode */
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parsed_instruction->opcode = strdup(io->instructionbuf_elementv[0]);
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/* Copy element values to parsed instruction */
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for (j=0; j<parsed_instruction->argc; j++)
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parsed_instruction->argv[j] = strdup(io->instructionbuf_elementv[j+1]);
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/* Reset buffer */
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memmove(io->instructionbuf, io->instructionbuf + i + 1, io->instructionbuf_used_length - i - 1);
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io->instructionbuf_used_length -= i + 1;
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io->instructionbuf_parse_start = 0;
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io->instructionbuf_elementc = 0;
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/* Done */
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return 1;
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} /* end if terminator */
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} /* end if element fully read */
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/* Otherwise, read more data */
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else
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break;
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/* Done */
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return 1;
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}
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}
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