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Implemented support for new instruction format (inbound), simplified instruction parsing.

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This commit is contained in:
Michael Jumper 2011-10-19 01:28:18 -07:00
parent 197029c3d8
commit 076b749225
3 changed files with 80 additions and 41 deletions
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16
libguac/include/guacio.h
View File

@ -86,6 +86,11 @@ typedef struct GUACIO {
*/
char out_buf[8192];
/**
* The current location of parsing within the instruction buffer.
*/
int instructionbuf_parse_start;
/**
* The current size of the instruction buffer.
*/
@ -103,6 +108,17 @@ typedef struct GUACIO {
*/
char* instructionbuf;
/**
* The number of elements parsed so far.
*/
int instructionbuf_elementc;
/**
* Array of pointers into the instruction buffer, where each pointer
* points to the start of the corresponding element.
*/
char* instructionbuf_elementv[64];
} GUACIO;
/**

2
libguac/src/guacio.c
View File

@ -73,6 +73,8 @@ GUACIO* guac_open(int fd) {
io->instructionbuf_size = 1024;
io->instructionbuf = malloc(io->instructionbuf_size);
io->instructionbuf_used_length = 0;
io->instructionbuf_parse_start = 0;
io->instructionbuf_elementc = 0;
return io;

95
libguac/src/protocol.c
View File

@ -359,62 +359,83 @@ int __guac_fill_instructionbuf(GUACIO* io) {
int guac_read_instruction(GUACIO* io, guac_instruction* parsed_instruction) {
int retval;
int i = 0;
int argcount = 0;
int j;
int current_arg = 0;
int i = io->instructionbuf_parse_start;
/* Loop until a instruction is read */
for (;;) {
/* Search for end of instruction */
for (; i < io->instructionbuf_used_length; i++) {
/* Length of element */
int element_length = 0;
/* Count arguments as we look for the end */
if (io->instructionbuf[i] == ',')
argcount++;
else if (io->instructionbuf[i] == ':' && argcount == 0)
argcount++;
/* Parse instruction in buffe */
while (i < io->instructionbuf_used_length) {
/* End found ... */
else if (io->instructionbuf[i] == ';') {
/* Read character from buffer */
char c = io->instructionbuf[i++];
/* Parse new instruction */
char* instruction = malloc(i+1);
memcpy(instruction, io->instructionbuf, i+1);
instruction[i] = '\0'; /* Replace semicolon with null terminator. */
/* If digit, calculate element length */
if (c >= '0' && c <= '9')
element_length = element_length * 10 + c - '0';
parsed_instruction->opcode = NULL;
/* Otherwise, if end of length */
else if (c == '.') {
parsed_instruction->argc = argcount;
parsed_instruction->argv = malloc(sizeof(char*) * argcount);
/* Verify element is fully read */
if (i + element_length < io->instructionbuf_used_length) {
for (j=0; j<i; j++) {
/* Get element value */
char* elementv = &(io->instructionbuf[i]);
/* If encountered a colon, and no opcode parsed yet, set opcode and following argument */
if (instruction[j] == ':' && parsed_instruction->opcode == NULL) {
instruction[j] = '\0';
parsed_instruction->argv[current_arg++] = &(instruction[j+1]);
parsed_instruction->opcode = instruction;
}
/* Get terminator, set null terminator of elementv */
char terminator = elementv[element_length];
elementv[element_length] = '\0';
/* If encountered a comma, set following argument */
else if (instruction[j] == ',') {
instruction[j] = '\0';
parsed_instruction->argv[current_arg++] = &(instruction[j+1]);
}
}
/* Move to terminator of element */
i += element_length;
/* If no arguments, set opcode to entire instruction */
if (parsed_instruction->opcode == NULL)
parsed_instruction->opcode = instruction;
/* Reset element length */
element_length = 0;
/* Found. Reset buffer */
/* As element has been read successfully, update
* parse start */
io->instructionbuf_parse_start = i;
/* Save element */
io->instructionbuf_elementv[io->instructionbuf_elementc++] = elementv;
/* Finish parse if terminator is a semicolon */
if (terminator == ';') {
int j;
/* Init parsed instruction */
parsed_instruction->argc = io->instructionbuf_elementc - 1;
parsed_instruction->argv = malloc(sizeof(char*) * parsed_instruction->argc);
/* Set opcode */
parsed_instruction->opcode = strdup(io->instructionbuf_elementv[0]);
/* Copy element values to parsed instruction */
for (j=0; j<parsed_instruction->argc; j++)
parsed_instruction->argv[j] = strdup(io->instructionbuf_elementv[j+1]);
/* Reset buffer */
memmove(io->instructionbuf, io->instructionbuf + i + 1, io->instructionbuf_used_length - i - 1);
io->instructionbuf_used_length -= i + 1;
io->instructionbuf_parse_start = 0;
io->instructionbuf_elementc = 0;
/* Done */
return 1;
} /* end if terminator */
} /* end if element fully read */
/* Otherwise, read more data */
else
break;
}
}