Reentrant versions of getprotoent(3) and getservent(3). Adapted from

changes in NetBSD by Christos.  OK otto@

1 files changed, 82 insertions, 39 deletions

diff --git a/src/lib/libc/net/getprotoent.c b/src/lib/libc/net/getprotoent.c
index b2bdd2e164..f3327db9bd 100644
--- a/src/lib/libc/net/getprotoent.c
+++ b/src/lib/libc/net/getprotoent.c
@@ -28,69 +28,68 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char rcsid[] = "$OpenBSD: getprotoent.c,v 1.5 2003/06/02 20:18:35 millert Exp $";
+static char rcsid[] = "$OpenBSD: getprotoent.c,v 1.6 2004/10/17 20:24:23 millert Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <sys/types.h>
 #include <sys/socket.h>
+
+#include <errno.h>
 #include <netdb.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
-#define MAXALIASES      35
-
-static FILE *protof = NULL;
-static char line[BUFSIZ+1];
-static struct protoent proto;
-static char *proto_aliases[MAXALIASES];
-int _proto_stayopen;
-
 void
-setprotoent(f)
-        int f;
+setprotoent_r(int f, struct protoent_data *pd)
 {
-        if (protof == NULL)
-                protof = fopen(_PATH_PROTOCOLS, "r" );
+        if (pd->fp == NULL)
+                pd->fp = fopen(_PATH_PROTOCOLS, "r" );
         else
-                rewind(protof);
-        _proto_stayopen |= f;
+                rewind(pd->fp);
+        pd->stayopen |= f;
 }
 
 void
-endprotoent()
+endprotoent_r(struct protoent_data *pd)
 {
-        if (protof) {
-                fclose(protof);
-                protof = NULL;
+        if (pd->fp) {
+                fclose(pd->fp);
+                pd->fp = NULL;
         }
-        _proto_stayopen = 0;
+        free(pd->aliases);
+        pd->aliases = NULL;
+        pd->maxaliases = 0;
+        free(pd->line);
+        pd->line = NULL;
+        pd->stayopen = 0;
 }
 
 struct protoent *
-getprotoent()
+getprotoent_r(struct protoent *pe, struct protoent_data *pd)
 {
         char *p, *cp, **q, *endp;
-        long l;
         size_t len;
+        long l;
+        int serrno;
 
-        if (protof == NULL && (protof = fopen(_PATH_PROTOCOLS, "r" )) == NULL)
+        if (pd->fp == NULL && (pd->fp = fopen(_PATH_PROTOCOLS, "r" )) == NULL)
                 return (NULL);
 again:
-        if ((p = fgetln(protof, &len)) == NULL)
+        if ((p = fgetln(pd->fp, &len)) == NULL)
                 return (NULL);
+        if (len == 0 || *p == '#' || *p == '\n')
+                goto again;
         if (p[len-1] == '\n')
                 len--;
-        if (len >= sizeof(line) || len == 0)
-                goto again;
-        p = memcpy(line, p, len);
-        line[len] = '\0';
-        if (*p == '#')
-                goto again;
-        if ((cp = strchr(p, '#')) != NULL)
-                *cp = '\0';
-        proto.p_name = p;
-        cp = strpbrk(p, " \t");
+        if ((cp = memchr(p, '#', len)) != NULL)
+                len = cp - p;
+        cp = realloc(pd->line, len + 1);
+        if (cp == NULL)
+                return (NULL);
+        pd->line = pe->p_name = memcpy(cp, p, len);
+        cp[len] = '\0';
+        cp = strpbrk(cp, " \t");
         if (cp == NULL)
                 goto again;
         *cp++ = '\0';
@@ -102,8 +101,18 @@ again:
         l = strtol(cp, &endp, 10);
         if (endp == cp || *endp != '\0' || l < 0 || l >= INT_MAX)
                 goto again;
-        proto.p_proto = l;
-        q = proto.p_aliases = proto_aliases;
+        pe->p_proto = l;
+        if (pd->aliases == NULL) {
+                pd->maxaliases = 5;
+                pd->aliases = malloc(pd->maxaliases * sizeof(char *));
+                if (pd->aliases == NULL) {
+                        serrno = errno;
+                        endprotoent_r(pd);
+                        errno = serrno;
+                        return (NULL);
+                }
+        }
+        q = pe->p_aliases = pd->aliases;
         if (p != NULL) {
                 cp = p;
                 while (cp && *cp) {
@@ -111,13 +120,47 @@ again:
                                 cp++;
                                 continue;
                         }
-                        if (q < &proto_aliases[MAXALIASES - 1])
-                                *q++ = cp;
+                        if (q == &pe->p_aliases[pd->maxaliases - 1]) {
+                                p = realloc(pe->p_aliases,
+                                    2 * pd->maxaliases * sizeof(char *));
+                                if (p == NULL) {
+                                        serrno = errno;
+                                        endprotoent_r(pd);
+                                        errno = serrno;
+                                        return (NULL);
+                                }
+                                pd->maxaliases *= 2;
+                                q = (char **)p + (q - pe->p_aliases);
+                                pe->p_aliases = pd->aliases = (char **)p;
+                        }
+                        *q++ = cp;
                         cp = strpbrk(cp, " \t");
                         if (cp != NULL)
                                 *cp++ = '\0';
                 }
         }
         *q = NULL;
-        return (&proto);
+        return (pe);
+}
+
+struct protoent_data _protoent_data;    /* shared with getproto{,name}.c */
+
+void
+setprotoent(int f)
+{
+        setprotoent_r(f, &_protoent_data);
+}
+
+void
+endprotoent(void)
+{
+        endprotoent_r(&_protoent_data);
+}
+
+struct protoent *
+getprotoent(void)
+{
+        static struct protoent proto;
+
+        return getprotoent_r(&proto, &_protoent_data);
 }