386BSD 0.1 development

Work on file usr/src/usr.sbin/dbsym/dbsym.c

Co-Authored-By: Lynne Greer Jolitz <ljolitz@cardio.ucsf.edu>
Synthesized-from: 386BSD-0.1

diff --git a/usr/src/usr.sbin/dbsym/dbsym.c b/usr/src/usr.sbin/dbsym/dbsym.c
new file mode 100644 (file)
index 0000000..46514b4
--- /dev/null
+++ b/usr/src/usr.sbin/dbsym/dbsym.c
@@ -0,0 +1,192 @@
+/* Written by Pace Willisson (pace@blitz.com)
+ * and placed in the public domain.
+ */
+#include <stdio.h>
+#include <a.out.h>
+
+char *malloc ();
+
+#define FILE_OFFSET(vadr) (((vadr) & ~0xff000000)-N_DATADDR(hdr)+N_DATOFF(hdr))
+
+struct nlist *old_syms;
+int num_old_syms;
+char *old_strtab;
+int old_strtab_size;
+
+struct nlist *new_syms;
+int num_new_syms;
+int new_syms_bytes;
+char *new_strtab;
+int new_strtab_size;
+
+int db_symtabsize_adr;
+int db_symtab_adr;
+
+int avail;
+
+
+usage ()
+{
+       fprintf (stderr, "usage: dbsym file\n");
+       exit (1);
+}
+
+struct exec hdr;
+
+main (argc, argv)
+char **argv;
+{
+       FILE *f;
+       char *name;
+       extern int optind;
+       int c, i;
+       int need;
+       char *buf, *p;
+       struct nlist *nsp, *sp;
+       int len;
+
+
+       while ((c = getopt (argc, argv, "")) != EOF) {
+               switch (c) {
+               default:
+                       usage ();
+               }
+       }
+
+       if (optind >= argc)
+               usage ();
+
+       name = argv[optind++];
+
+       if (optind != argc)
+               usage ();
+
+       if ((f = fopen (name, "r+")) == NULL) {
+               fprintf (stderr, "can't open %s\n", name);
+               exit (1);
+       }
+
+       if (fread ((char *)&hdr, sizeof hdr, 1, f) != 1) {
+               fprintf (stderr, "can't read header\n");
+               exit (1);
+       }
+
+       if (N_BADMAG (hdr)) {
+               fprintf (stderr, "bad magic number\n");
+               exit (1);
+       }
+
+       if (hdr.a_syms == 0) {
+               fprintf (stderr, "no symbols\n");
+               exit (1);
+       }
+
+       fseek (f, N_STROFF (hdr), 0);
+       if (fread ((char *)&old_strtab_size, sizeof (int), 1, f) != 1) {
+               fprintf (stderr, "can't read old strtab size\n");
+               exit (1);
+       }
+
+       if ((old_syms = (struct nlist *)malloc (hdr.a_syms)) == NULL
+           || ((old_strtab = malloc (old_strtab_size)) == NULL)
+           || ((new_syms = (struct nlist *)malloc (hdr.a_syms)) == NULL)
+           || ((new_strtab = malloc (old_strtab_size)) == NULL)) {
+               fprintf (stderr, "out of memory\n");
+               exit (1);
+       }
+
+       fseek (f, N_SYMOFF (hdr), 0);
+       if (fread ((char *)old_syms, hdr.a_syms, 1, f) != 1) {
+               fprintf (stderr, "can't read symbols\n");
+               exit (1);
+       }
+
+       fseek (f, N_STROFF (hdr), 0);
+       if (fread ((char *)old_strtab, old_strtab_size, 1, f) != 1) {
+               fprintf (stderr, "can't read string table\n");
+               exit (1);
+       }
+
+       num_old_syms = hdr.a_syms / sizeof (struct nlist);
+
+       new_strtab_size = 4;
+
+       nsp = new_syms;
+       for (i = 0, sp = old_syms; i < num_old_syms; i++, sp++) {
+               if (sp->n_type & N_STAB)
+                       continue;
+               if (sp->n_un.n_strx == 0)
+                       continue;
+
+               if (sp->n_value < 0xfe000000)
+                       continue;
+
+               if (sp->n_value >= 0xff000000)
+                       continue;
+
+               name = old_strtab + sp->n_un.n_strx;
+
+               len = strlen (name);
+
+               if (len == 0)
+                       continue;
+
+               if (len >= 2 && name[len - 2] == '.' && name[len - 1] == 'o')
+                       continue;
+
+               if (strcmp (name, "gcc_compiled.") == 0)
+                       continue;
+
+               *nsp = *sp;
+
+               nsp->n_un.n_strx = new_strtab_size;
+               strcpy (new_strtab + new_strtab_size, name);
+               new_strtab_size += len + 1;
+               nsp++;
+
+               if (strcmp (name, "_db_symtab") == 0)
+                       db_symtab_adr = sp->n_value;
+               if (strcmp (name, "_db_symtabsize") == 0)
+                       db_symtabsize_adr = sp->n_value;
+       }
+       
+       if (db_symtab_adr == 0 || db_symtabsize_adr == 0) {
+               fprintf (stderr, "couldn't find db_symtab symbols\n");
+               exit (1);
+       }
+
+       *(int *)new_strtab = new_strtab_size;
+       num_new_syms = nsp - new_syms;
+       new_syms_bytes = num_new_syms * sizeof (struct nlist);
+
+       need = sizeof (int)
+               + num_new_syms * sizeof (struct nlist)
+                       + new_strtab_size;
+
+       fseek (f, FILE_OFFSET (db_symtabsize_adr), 0);
+
+       if (fread ((char *)&avail, sizeof (int), 1, f) != 1) {
+               fprintf (stderr, "can't read symtabsize\n");
+               exit (1);
+       }
+
+       printf ("dbsym: need %d; avail %d\n", need, avail);
+
+       if (need > avail) {
+               fprintf (stderr, "not enough room in db_symtab array\n");
+               exit (1);
+       }
+
+       fseek (f, FILE_OFFSET (db_symtab_adr), 0);
+       fwrite ((char *)&new_syms_bytes, sizeof (int), 1, f);
+       fwrite ((char *)new_syms, new_syms_bytes, 1, f);
+       fwrite (new_strtab, new_strtab_size, 1, f);
+       fflush (f);
+
+       if (feof (f) || ferror (f)) {
+               fprintf (stderr, "write error\n");
+               exit (1);
+       }
+       exit (0);
+}
+