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#include "arg.h"
#include "dbg.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct arg
{
const char *s;
int (*f)(struct args *, const char *);
enum
{
NOVAL,
SPACEVAL = 1,
EQVAL = 1 << 1,
JOINVAL = 1 << 2
} v;
};
static int debug(struct args *a, const char *arg)
{
dbgen++;
return 0;
}
static int target(struct args *a, const char *arg)
{
if (!strcmp(arg, "qbe"))
a->tgt = QBE;
else
{
fprintf(stderr, "invalid or unsupported target \"%s\"", arg);
return -1;
}
return 0;
}
static int inc(struct args *a, const char *arg)
{
struct arg_input *i = &a->incs;
size_t n = i->n + 1;
const char **v = realloc(i->v, n * sizeof *v);
if (!v)
{
perror("realloc(3)");
return -1;
}
v[i->n++] = arg;
i->v = v;
return 0;
}
static int opt(struct args *args, const struct arg *a, const char *arg)
{
const struct arg *prev = args->arg;
const char *v = arg + strlen(a->s);
if (prev && prev->v)
{
fprintf(stderr, "%s: option '%s' requires a value\n", args->name,
prev->s);
return -1;
}
else if (*v)
{
if (!(a->v & JOINVAL))
{
fprintf(stderr, "%s: unrecognized command-line option '%s'\n",
args->name, arg);
return -1;
}
}
else if (a->v & SPACEVAL)
{
args->arg = a;
return 0;
}
else
v = NULL;
return a->f(args, v);
}
int arg(struct args *a, const char *value)
{
static const struct arg args[] =
{
{"-d", debug},
{"-t", target},
{"-I", inc, SPACEVAL | JOINVAL}
};
const struct arg *prev = a->arg;
for (size_t i = 0; i < sizeof args / sizeof *args; i++)
{
const struct arg *arg = &args[i];
if (!strncmp(value, arg->s, strlen(arg->s)))
return opt(a, arg, value);
}
if (prev)
{
if (*value != '-' && prev->f(a, value))
return -1;
a->arg = NULL;
}
else if (a->src)
{
fprintf(stderr, "%s: only one source file allowed\n", a->name);
return -1;
}
else
a->src = value;
return 0;
}
void arg_defaults(struct args *a)
{
a->tgt = QBE;
}
static void free_input(struct arg_input *i)
{
free(i->v);
}
void arg_free(struct args *a)
{
free_input(&a->incs);
}
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