4.3BSD/usr/src/bin/nm.c
#ifndef lint
static char sccsid[] = "@(#)nm.c 4.7 5/19/86";
#endif
/*
* nm - print name list; VAX string table version
*/
#include <sys/types.h>
#include <ar.h>
#include <stdio.h>
#include <ctype.h>
#include <a.out.h>
#include <stab.h>
#include <sys/stat.h>
#define SELECT archive ? archdr.ar_name : *xargv
int aflg, gflg, nflg, oflg, pflg, uflg;
int rflg = 1;
char **xargv;
int archive;
struct ar_hdr archdr;
union {
char mag_armag[SARMAG+1];
struct exec mag_exp;
} mag_un;
#define OARMAG 0177545
FILE *fi;
off_t off;
off_t ftell();
char *malloc();
char *realloc();
char *strp;
char *stab();
off_t strsiz;
int compare();
int narg;
int errs;
main(argc, argv)
char **argv;
{
if (--argc>0 && argv[1][0]=='-' && argv[1][1]!=0) {
argv++;
while (*++*argv) switch (**argv) {
case 'n':
nflg++;
continue;
case 'g':
gflg++;
continue;
case 'u':
uflg++;
continue;
case 'r':
rflg = -1;
continue;
case 'p':
pflg++;
continue;
case 'o':
oflg++;
continue;
case 'a':
aflg++;
continue;
default:
fprintf(stderr, "nm: invalid argument -%c\n",
*argv[0]);
exit(2);
}
argc--;
}
if (argc == 0) {
argc = 1;
argv[1] = "a.out";
}
narg = argc;
xargv = argv;
while (argc--) {
++xargv;
namelist();
}
exit(errs);
}
namelist()
{
register int j;
archive = 0;
fi = fopen(*xargv, "r");
if (fi == NULL) {
error(0, "cannot open");
return;
}
off = SARMAG;
fread((char *)&mag_un, 1, sizeof(mag_un), fi);
if (mag_un.mag_exp.a_magic == OARMAG) {
error(0, "old archive");
goto out;
}
if (strncmp(mag_un.mag_armag, ARMAG, SARMAG)==0)
archive++;
else if (N_BADMAG(mag_un.mag_exp)) {
error(0, "bad format");
goto out;
}
fseek(fi, 0L, 0);
if (archive) {
nextel(fi);
if (narg > 1)
printf("\n%s:\n", *xargv);
}
do {
off_t o;
register i, n, c;
struct nlist *symp = NULL;
struct nlist sym;
struct stat stb;
fread((char *)&mag_un.mag_exp, 1, sizeof(struct exec), fi);
if (N_BADMAG(mag_un.mag_exp))
continue;
if (archive == 0)
fstat(fileno(fi), &stb);
o = N_SYMOFF(mag_un.mag_exp) - sizeof (struct exec);
fseek(fi, o, 1);
n = mag_un.mag_exp.a_syms / sizeof(struct nlist);
if (n == 0) {
error(0, "no name list");
continue;
}
if (N_STROFF(mag_un.mag_exp) + sizeof (off_t) >
(archive ? off : stb.st_size)) {
error(0, "old format .o (no string table) or truncated file");
continue;
}
i = 0;
if (strp)
free(strp), strp = 0;
while (--n >= 0) {
fread((char *)&sym, 1, sizeof(sym), fi);
if (gflg && (sym.n_type&N_EXT)==0)
continue;
if ((sym.n_type&N_STAB) && (!aflg||gflg||uflg))
continue;
if (symp==NULL)
symp = (struct nlist *)
malloc(sizeof(struct nlist));
else
symp = (struct nlist *)
realloc(symp,
(i+1)*sizeof(struct nlist));
if (symp == NULL)
error(1, "out of memory");
symp[i++] = sym;
}
if (archive && ftell(fi)+sizeof(off_t) >= off) {
error(0, "no string table (old format .o?)");
continue;
}
if (fread((char *)&strsiz,sizeof(strsiz),1,fi) != 1) {
error(0, "no string table (old format .o?)");
goto out;
}
strp = (char *)malloc(strsiz);
if (strp == NULL)
error(1, "ran out of memory");
if (fread(strp+sizeof(strsiz),strsiz-sizeof(strsiz),1,fi) != 1)
error(1, "error reading string table");
for (j = 0; j < i; j++)
if (symp[j].n_un.n_strx)
symp[j].n_un.n_name =
symp[j].n_un.n_strx + strp;
else
symp[j].n_un.n_name = "";
if (pflg==0)
qsort(symp, i, sizeof(struct nlist), compare);
if ((archive || narg>1) && oflg==0)
printf("\n%s:\n", SELECT);
psyms(symp, i);
if (symp)
free((char *)symp), symp = 0;
if (strp)
free((char *)strp), strp = 0;
} while(archive && nextel(fi));
out:
fclose(fi);
}
psyms(symp, nsyms)
register struct nlist *symp;
int nsyms;
{
register int n, c;
for (n=0; n<nsyms; n++) {
c = symp[n].n_type;
if (c & N_STAB) {
if (oflg) {
if (archive)
printf("%s:", *xargv);
printf("%s:", SELECT);
}
printf("%08x - %02x %04x %5.5s %s\n",
symp[n].n_value,
symp[n].n_other & 0xff, symp[n].n_desc & 0xffff,
stab(symp[n].n_type & 0xff),
symp[n].n_un.n_name);
continue;
}
if (c == N_FN)
c = 'f';
else switch (c&N_TYPE) {
case N_UNDF:
c = 'u';
if (symp[n].n_value)
c = 'c';
break;
case N_ABS:
c = 'a';
break;
case N_TEXT:
c = 't';
break;
case N_DATA:
c = 'd';
break;
case N_BSS:
c = 'b';
break;
default:
c = '?';
break;
}
if (uflg && c!='u')
continue;
if (oflg) {
if (archive)
printf("%s:", *xargv);
printf("%s:", SELECT);
}
if (symp[n].n_type&N_EXT)
c = toupper(c);
if (!uflg) {
if (c=='u' || c=='U')
printf(" ");
else
printf(N_FORMAT, symp[n].n_value);
printf(" %c ", c);
}
printf("%s\n", symp[n].n_un.n_name);
l1: ;
}
}
compare(p1, p2)
struct nlist *p1, *p2;
{
register i;
if (nflg) {
if (p1->n_value > p2->n_value)
return(rflg);
if (p1->n_value < p2->n_value)
return(-rflg);
}
return (rflg * strcmp(p1->n_un.n_name, p2->n_un.n_name));
}
nextel(af)
FILE *af;
{
register char *cp;
register r;
long arsize;
fseek(af, off, 0);
r = fread((char *)&archdr, 1, sizeof(struct ar_hdr), af);
if (r != sizeof(struct ar_hdr))
return(0);
for (cp = archdr.ar_name; cp < &archdr.ar_name[sizeof(archdr.ar_name)]; cp++)
if (*cp == ' ')
*cp = '\0';
arsize = atol(archdr.ar_size);
if (arsize & 1)
++arsize;
off = ftell(af) + arsize; /* beginning of next element */
return(1);
}
error(n, s)
char *s;
{
fprintf(stderr, "nm: %s:", *xargv);
if (archive) {
fprintf(stderr, "(%s)", archdr.ar_name);
fprintf(stderr, ": ");
} else
fprintf(stderr, " ");
fprintf(stderr, "%s\n", s);
if (n)
exit(2);
errs = 1;
}
struct stabnames {
int st_value;
char *st_name;
} stabnames[] ={
N_GSYM, "GSYM",
N_FNAME, "FNAME",
N_FUN, "FUN",
N_STSYM, "STSYM",
N_LCSYM, "LCSYM",
N_RSYM, "RSYM",
N_SLINE, "SLINE",
N_SSYM, "SSYM",
N_SO, "SO",
N_LSYM, "LSYM",
N_SOL, "SOL",
N_PSYM, "PSYM",
N_ENTRY, "ENTRY",
N_LBRAC, "LBRAC",
N_RBRAC, "RBRAC",
N_BCOMM, "BCOMM",
N_ECOMM, "ECOMM",
N_ECOML, "ECOML",
N_LENG, "LENG",
N_PC, "PC",
0, 0
};
char *
stab(val)
{
register struct stabnames *sp;
static char prbuf[32];
for (sp = stabnames; sp->st_name; sp++)
if (sp->st_value == val)
return (sp->st_name);
sprintf(prbuf, "%02x", val);
return (prbuf);
}