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#define _XOPEN_SOURCE 700
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "cc.h"
#include "cpp.h"
static void dump(struct macro *list)
{
for (struct macro *p = list; p != NULL; p = p->next) {
if (p->file) {
printf("%s:%ju: ", p->file, p->line);
} else if (p->line == 0) {
printf("<BUILTIN>: ");
} else {
printf("<COMMAND LINE>: ");
}
printf("'%s' => '%s'\n", p->identifier, p->replacement);
}
}
static char *next_token(FILE *f, const char *fn, uintmax_t line)
{
char *token = NULL;
size_t tlen = 0;
size_t pos = 0;
int c = 0;
while ((c = fgetc(f)) != EOF) {
if (isspace(c)) {
if (pos == 0) {
return " ";
}
ungetc(c, f);
return token;
}
if (strchr("+-*/=<>!&|[]{}()'\"", c)) {
if (pos == 0) {
token = calloc(2, 1);
token[0] = c;
return token;
}
ungetc(c, f);
return token;
}
if (pos >= tlen) {
tlen += 16;
char *tmp = realloc(token, tlen);
if (!tmp) {
error(fn, line, "out of memory");
}
token = tmp;
memset(token + pos, '\0', tlen - pos);
}
token[pos++] = c;
}
if (pos == 0) {
return NULL;
}
return token;
}
int preprocess(const char *in, const char *out, struct macro *predefined)
{
(void)in; (void)out;
time_t now = time(NULL);
struct tm *tm = localtime(&now);
char compiletime[16] = { 0 };
char compiledate[16] = { 0 };
strftime(compiletime, sizeof(compiletime), "%T", tm);
strftime(compiledate, sizeof(compiledate), "%b %e %Y", tm);
struct macro *perfile = define(NULL, NULL, 0, "__DATE__", compiledate);
define(perfile, NULL, 0, "__TIME__", compiletime);
define(perfile, NULL, 0, "__FILE__", in);
define(perfile, NULL, 0, "__LINE__", "0");
dump(predefined);
dump(perfile);
FILE *f = fopen(in, "r");
if (f == NULL) {
error(NULL, 0, "%s: %s\n", in, strerror(errno));
}
char *token;
while ((token = next_token(f, in, 0)) != NULL) {
printf("%s\n", token);
}
fclose(f);
return 0;
}
static struct macro *do_define(struct macro *list, const char *file, uintmax_t line, const char *macro, const char *replacement)
{
struct macro *def = list;
/* TODO: replace existing thing */
/* TODO: prevent redefining builtins */
if (def == NULL) {
def = calloc(1, sizeof(*def));
list = def;
} else {
while (def->next != NULL) {
def = def->next;
}
def->next = calloc(1, sizeof(*def));
def = def->next;
}
if (def == NULL) {
return NULL;
}
if (file) {
def->file = strdup(file);
if (file == NULL) {
return NULL;
}
}
def->line = line;
def->identifier = strdup(macro);
def->replacement = strdup(replacement);
if (def->identifier == NULL || def->replacement == NULL) {
return NULL;
}
return list;
}
struct macro *define(struct macro *list, const char *file, uintmax_t line, const char *macro, const char *replacement)
{
list = do_define(list, file, line, macro, replacement);
if (list == NULL) {
error(file, line, "out of memory defining macro");
}
return list;
}
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