BSD 3 development

Work on file usr/src/libc/gen/nlist.c

Synthesized-from: 3bsd

diff --git a/usr/src/libc/gen/nlist.c b/usr/src/libc/gen/nlist.c
new file mode 100644 (file)
index 0000000..54eed0e
--- /dev/null
+++ b/usr/src/libc/gen/nlist.c
@@ -0,0 +1,59 @@
+#include <a.out.h>
+int a_magic[] = {A_MAGIC1, A_MAGIC2, A_MAGIC3, A_MAGIC4, 0};
+#define SPACE 100              /* number of symbols read at a time */
+
+nlist(name, list)
+char *name;
+struct nlist *list;
+{
+       register struct nlist *p, *q;
+       register int f, n, m, i, nreq;
+       long sa;
+       struct exec buf;
+       struct nlist space[SPACE];
+
+       for(p = list, nreq = 0; p->n_name[0]; p++, nreq++) {
+               p->n_type = 0;
+               p->n_value = 0;
+       }
+       f = open(name, 0);
+       if(f < 0)
+               return(-1);
+       read(f, (char *)&buf, sizeof buf);
+       for(i=0; a_magic[i]; i++)
+               if(a_magic[i] == buf.a_magic) break;
+       if(a_magic[i] == 0){
+               close(f);
+               return(-1);
+       }
+       sa = buf.a_text + (long)buf.a_data;
+       sa += buf.a_trsize + buf.a_drsize;
+       sa += sizeof buf;
+       lseek(f, sa, 0);
+       n = buf.a_syms;
+
+       while(n){
+               m = sizeof space;
+               if(n < sizeof space)
+                       m = n;
+               read(f, (char *)space, m);
+               n -= m;
+               for(q = space; (m -= sizeof(struct nlist)) >= 0; q++) {
+                       for(p = list; p->n_name[0]; p++) {
+                               for(i=0;i<8;i++)
+                                       if(p->n_name[i] != q->n_name[i]) goto cont;
+                               p->n_value = q->n_value;
+                               p->n_type = q->n_type;
+                               if(--nreq == 0)
+                                       goto alldone;
+                               break;
+               cont:           ;
+                       }
+               }
+       }
+alldone:
+       close(f);
+       return(0);
+}
+
+