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/*
* utils.h - Some helper code for debugging and error logging.
*/
#define streq(a, b) (strcmp(a, b) == 0)
// TODO: better error reporting
#define check(cond, ...) do { if (!(cond)) { fprintf(stderr, __VA_ARGS__); fwrite("\n", 1, 1, stderr); _exit(1); } } while(0)
#define debug(...) do { if (verbose) fprintf(stderr, __VA_ARGS__); } while(0)
static int verbose = 0;
static int visualize_delay = -1;
/*
* Helper function to skip past all spaces (and comments)
* Returns a pointer to the first non-space character.
*/
static inline const char *after_spaces(const char *str)
{
// Skip whitespace and comments:
skip_whitespace:
switch (*str) {
case ' ': case '\r': case '\n': case '\t': {
++str;
goto skip_whitespace;
}
case '#': {
while (*str && *str != '\n') ++str;
goto skip_whitespace;
}
}
return str;
}
static inline int matchchar(const char **str, char c)
{
*str = after_spaces(*str);
if (**str == c) {
++(*str);
return 1;
} else {
return 0;
}
}
static void visualize(const char *source, const char *ptr, const char *msg)
{
if (!verbose) return;
fprintf(stderr, "\033[0;1m\r\033[2A\033[K%.*s\033[0;2m%s\033[0m\n",
(int)(ptr-source), source, ptr);
fprintf(stderr, "\033[0;1m");
for (--ptr ; ptr > source; --ptr) putc(' ', stderr);
fprintf(stderr, "^\033[K\n");
if (msg)
fprintf(stderr, "\033[K\033[33;1m%s\033[0m", msg);
if (visualize_delay > 0)
usleep(visualize_delay);
}
/*
* Write an unescaped version of `src` to `dest` (at most bufsize-1 chars,
* terminated by a null byte)
*/
static size_t unescape_string(char *dest, const char *src, size_t bufsize)
{
size_t len = 0;
#define PUT(c) do { *(dest++) = (char)(c); ++len; } while (0)
for ( ; *src && len < bufsize; ++src) {
if (*src != '\\') {
PUT(*src);
continue;
}
++src;
switch (*src) {
case 'a': PUT('\a'); break; case 'b': PUT('\b'); break;
case 'n': PUT('\n'); break; case 'r': PUT('\r'); break;
case 't': PUT('\t'); break; case 'v': PUT('\v'); break;
case 'e': PUT('\033'); break;
case 'x': { // Hex
static const char hextable[255] = {
['0']=0x10, ['1']=0x1, ['2']=0x2, ['3']=0x3, ['4']=0x4,
['5']=0x5, ['6']=0x6, ['7']=0x7, ['8']=0x8, ['9']=0x9,
['a']=0xa, ['b']=0xb, ['c']=0xc, ['d']=0xd, ['e']=0xe, ['f']=0xf,
['A']=0xa, ['B']=0xb, ['C']=0xc, ['D']=0xd, ['E']=0xe, ['F']=0xf,
};
if (hextable[(int)src[1]] && hextable[(int)src[2]]) {
PUT((hextable[(int)src[1]] << 4) | (hextable[(int)src[2]] & 0xF));
src += 2;
}
break;
}
case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': { // Octal
int c = *src - '0';
if ('0' <= src[1] && src[1] <= '7') {
++src;
c = (c << 3) | (*src - '0');
if ('0' <= src[1] && src[1] <= '7' && (c << 3) < 256) {
++src;
c = (c << 3) | (*src - '0');
}
}
PUT(c);
break;
}
default: PUT(*src); break;
}
}
*dest = '\0';
return len;
#undef PUT
}
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