regs/parser.c
2018-08-19 17:24:54 -07:00

67 lines
1.3 KiB
C

/**
* @copyright 2018 Sean Kasun
* Routines for parsing a simple config file
*/
#include "parser.h"
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
void fail(ConfigFile *f, char *format, ...) {
// calculate line and column
int line = 1;
int col = 1;
bool done = false;
while (f->p > f->start) {
if (*f->p == '\n') {
done = true;
line++;
}
if (!done) {
col++;
}
f->p--;
}
va_list args;
va_start(args, format);
fprintf(stderr, "%s[%d,%d] Error: ", f->filename, line, col);
vfprintf(stderr, format, args);
fprintf(stderr, "\n");
va_end(args);
exit(-1);
}
void eatSpaces(ConfigFile *f) {
while (f->p < f->end && isspace(*f->p)) {
f->p++;
}
}
bool token(ConfigFile *f, char ch) {
eatSpaces(f);
if (f->p < f->end && *f->p == ch) { // found it, consume
f->p++;
return true;
}
// not found, don't consume anything
return false;
}
uint32_t hex(ConfigFile *f) {
eatSpaces(f);
uint32_t res = 0;
while (f->p < f->end && isxdigit(*f->p)) {
res <<= 4;
if (*f->p >= '0' && *f->p <= '9') {
res |= *f->p - '0';
} else if (*f->p >= 'a' && *f->p <= 'f') {
res |= *f->p - 'a' + 10;
} else if (*f->p >= 'A' && *f->p <= 'F') {
res |= *f->p - 'A' + 10;
}
f->p++;
}
return res;
}