#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include "file.h"
#ifndef lint
#if 0
static char *moduleid = "$OpenBSD: apprentice.c,v 1.4 1997/02/09 23:58:16 millert Exp $";
#endif
#endif
#define EATAB {while (isascii((unsigned char) *l) && \
isspace((unsigned char) *l)) ++l;}
#define LOWCASE(l) (isupper((unsigned char) (l)) ? \
tolower((unsigned char) (l)) : (l))
static int getvalue __P((struct magic *, char **));
static int hextoint __P((int));
static char *getstr __P((char *, char *, int, int *));
static int parse __P((char *, int *, int));
static void eatsize __P((char **));
static int maxmagic = 0;
static int apprentice_1 __P((char *, int));
int
apprentice(fn, check)
char *fn;
int check;
{
char *p, *mfn;
int file_err, errs = -1;
maxmagic = MAXMAGIS;
magic = (struct magic *) calloc(sizeof(struct magic), maxmagic);
mfn = malloc(strlen(fn)+1);
if (magic == NULL || mfn == NULL) {
(void) fprintf(stderr, "%s: Out of memory.\n", progname);
if (check)
return -1;
else
exit(1);
}
fn = strcpy(mfn, fn);
while (fn) {
p = strchr(fn, ':');
if (p)
*p++ = '\0';
file_err = apprentice_1(fn, check);
if (file_err > errs)
errs = file_err;
fn = p;
}
if (errs == -1)
(void) fprintf(stderr, "%s: couldn't find any magic files!\n",
progname);
if (!check && errs)
exit(1);
free(mfn);
return errs;
}
static int
apprentice_1(fn, check)
char *fn;
int check;
{
static const char hdr[] =
"cont\toffset\ttype\topcode\tmask\tvalue\tdesc";
FILE *f;
char line[BUFSIZ+1];
int errs = 0;
f = fopen(fn, "r");
if (f==NULL) {
if (errno != ENOENT)
(void) fprintf(stderr,
"%s: can't read magic file %s (%s)\n",
progname, fn, strerror(errno));
return -1;
}
if (check)
(void) printf("%s\n", hdr);
for (lineno = 1;fgets(line, BUFSIZ, f) != NULL; lineno++) {
if (line[0]=='#')
continue;
if (strlen(line) <= (unsigned)1)
continue;
line[strlen(line)-1] = '\0';
if (parse(line, &nmagic, check) != 0)
errs = 1;
}
(void) fclose(f);
return errs;
}
uint32
signextend(m, v)
struct magic *m;
uint32 v;
{
if (!(m->flag & UNSIGNED))
switch(m->type) {
case BYTE:
v = (char) v;
break;
case SHORT:
case BESHORT:
case LESHORT:
v = (short) v;
break;
case DATE:
case BEDATE:
case LEDATE:
case LONG:
case BELONG:
case LELONG:
v = (int32) v;
break;
case STRING:
break;
default:
magwarn("can't happen: m->type=%d\n",
m->type);
return -1;
}
return v;
}
static int
parse(l, ndx, check)
char *l;
int *ndx, check;
{
int i = 0, nd = *ndx;
struct magic *m;
char *t, *s;
#define ALLOC_INCR 20
if (nd+1 >= maxmagic){
maxmagic += ALLOC_INCR;
if ((magic = (struct magic *) realloc(magic,
sizeof(struct magic) *
maxmagic)) == NULL) {
(void) fprintf(stderr, "%s: Out of memory.\n", progname);
if (check)
return -1;
else
exit(1);
}
memset(&magic[*ndx], 0, sizeof(struct magic) * ALLOC_INCR);
}
m = &magic[*ndx];
m->flag = 0;
m->cont_level = 0;
while (*l == '>') {
++l;
m->cont_level++;
}
if (m->cont_level != 0 && *l == '(') {
++l;
m->flag |= INDIR;
}
if (m->cont_level != 0 && *l == '&') {
++l;
m->flag |= ADD;
}
m->offset = (int) strtoul(l,&t,0);
if (l == t)
magwarn("offset %s invalid", l);
l = t;
if (m->flag & INDIR) {
m->in.type = LONG;
m->in.offset = 0;
if (*l == '.') {
l++;
switch (LOWCASE(*l)) {
case 'l':
m->in.type = LONG;
break;
case 'h':
case 's':
m->in.type = SHORT;
break;
case 'c':
case 'b':
m->in.type = BYTE;
break;
default:
magwarn("indirect offset type %c invalid", *l);
break;
}
l++;
}
s = l;
if (*l == '+' || *l == '-') l++;
if (isdigit((unsigned char)*l)) {
m->in.offset = strtoul(l, &t, 0);
if (*s == '-') m->in.offset = - m->in.offset;
}
else
t = l;
if (*t++ != ')')
magwarn("missing ')' in indirect offset");
l = t;
}
while (isascii((unsigned char)*l) && isdigit((unsigned char)*l))
++l;
EATAB;
#define NBYTE 4
#define NSHORT 5
#define NLONG 4
#define NSTRING 6
#define NDATE 4
#define NBESHORT 7
#define NBELONG 6
#define NBEDATE 6
#define NLESHORT 7
#define NLELONG 6
#define NLEDATE 6
if (*l == 'u') {
++l;
m->flag |= UNSIGNED;
}
if (strncmp(l, "byte", NBYTE)==0) {
m->type = BYTE;
l += NBYTE;
} else if (strncmp(l, "short", NSHORT)==0) {
m->type = SHORT;
l += NSHORT;
} else if (strncmp(l, "long", NLONG)==0) {
m->type = LONG;
l += NLONG;
} else if (strncmp(l, "string", NSTRING)==0) {
m->type = STRING;
l += NSTRING;
} else if (strncmp(l, "date", NDATE)==0) {
m->type = DATE;
l += NDATE;
} else if (strncmp(l, "beshort", NBESHORT)==0) {
m->type = BESHORT;
l += NBESHORT;
} else if (strncmp(l, "belong", NBELONG)==0) {
m->type = BELONG;
l += NBELONG;
} else if (strncmp(l, "bedate", NBEDATE)==0) {
m->type = BEDATE;
l += NBEDATE;
} else if (strncmp(l, "leshort", NLESHORT)==0) {
m->type = LESHORT;
l += NLESHORT;
} else if (strncmp(l, "lelong", NLELONG)==0) {
m->type = LELONG;
l += NLELONG;
} else if (strncmp(l, "ledate", NLEDATE)==0) {
m->type = LEDATE;
l += NLEDATE;
} else {
magwarn("type %s invalid", l);
return -1;
}
if (*l == '&') {
++l;
m->mask = signextend(m, strtoul(l, &l, 0));
eatsize(&l);
} else
m->mask = ~0L;
EATAB;
switch (*l) {
case '>':
case '<':
case '&':
case '^':
case '=':
m->reln = *l;
++l;
break;
case '!':
if (m->type != STRING) {
m->reln = *l;
++l;
break;
}
default:
if (*l == 'x' && isascii((unsigned char)l[1]) &&
isspace((unsigned char)l[1])) {
m->reln = *l;
++l;
goto GetDesc;
}
m->reln = '=';
break;
}
EATAB;
if (getvalue(m, &l))
return -1;
GetDesc:
EATAB;
if (l[0] == '\b') {
++l;
m->nospflag = 1;
} else if ((l[0] == '\\') && (l[1] == 'b')) {
++l;
++l;
m->nospflag = 1;
} else
m->nospflag = 0;
while ((m->desc[i++] = *l++) != '\0' && i<MAXDESC)
;
if (check) {
mdump(m);
}
++(*ndx);
return 0;
}
static int
getvalue(m, p)
struct magic *m;
char **p;
{
int slen;
if (m->type == STRING) {
*p = getstr(*p, m->value.s, sizeof(m->value.s), &slen);
m->vallen = slen;
} else
if (m->reln != 'x') {
m->value.l = signextend(m, strtoul(*p, p, 0));
eatsize(p);
}
return 0;
}
static char *
getstr(s, p, plen, slen)
register char *s;
register char *p;
int plen, *slen;
{
char *origs = s, *origp = p;
char *pmax = p + plen - 1;
register int c;
register int val;
while ((c = *s++) != '\0') {
if (isspace((unsigned char) c))
break;
if (p >= pmax) {
fprintf(stderr, "String too long: %s\n", origs);
break;
}
if(c == '\\') {
switch(c = *s++) {
case '\0':
goto out;
default:
*p++ = (char) c;
break;
case 'n':
*p++ = '\n';
break;
case 'r':
*p++ = '\r';
break;
case 'b':
*p++ = '\b';
break;
case 't':
*p++ = '\t';
break;
case 'f':
*p++ = '\f';
break;
case 'v':
*p++ = '\v';
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
val = c - '0';
c = *s++;
if(c >= '0' && c <= '7') {
val = (val<<3) | (c - '0');
c = *s++;
if(c >= '0' && c <= '7')
val = (val<<3) | (c-'0');
else
--s;
}
else
--s;
*p++ = (char)val;
break;
case 'x':
val = 'x';
c = hextoint(*s++);
if (c >= 0) {
val = c;
c = hextoint(*s++);
if (c >= 0)
val = (val << 4) + c;
else
--s;
} else
--s;
*p++ = (char)val;
break;
}
} else
*p++ = (char)c;
}
out:
*p = '\0';
*slen = p - origp;
return s;
}
static int
hextoint(c)
int c;
{
if (!isascii((unsigned char) c)) return -1;
if (isdigit((unsigned char) c)) return c - '0';
if ((c>='a')&&(c<='f')) return c + 10 - 'a';
if ((c>='A')&&(c<='F')) return c + 10 - 'A';
return -1;
}
void
showstr(fp, s, len)
FILE *fp;
const char *s;
int len;
{
register char c;
for (;;) {
c = *s++;
if (len == -1) {
if (c == '\0')
break;
}
else {
if (len-- == 0)
break;
}
if(c >= 040 && c <= 0176)
(void) fputc(c, fp);
else {
(void) fputc('\\', fp);
switch (c) {
case '\n':
(void) fputc('n', fp);
break;
case '\r':
(void) fputc('r', fp);
break;
case '\b':
(void) fputc('b', fp);
break;
case '\t':
(void) fputc('t', fp);
break;
case '\f':
(void) fputc('f', fp);
break;
case '\v':
(void) fputc('v', fp);
break;
default:
(void) fprintf(fp, "%.3o", c & 0377);
break;
}
}
}
}
static void
eatsize(p)
char **p;
{
char *l = *p;
if (LOWCASE(*l) == 'u')
l++;
switch (LOWCASE(*l)) {
case 'l':
case 's':
case 'h':
case 'b':
case 'c':
l++;
default:
break;
}
*p = l;
}