PR/474: be more careful about updating string positions:

1. if the numeric conversion failed, don't move the string pointer.
2. on escape parse failure restore the string position

diff --git a/src/apprentice.c b/src/apprentice.c
index ad87fc030492efd50e5ea4874debd047d188186f..66f64bd9dd11d4ab8ad558536912ec5a48c6b70c 100644 (file)
--- a/src/apprentice.c
+++ b/src/apprentice.c
@@ -32,7 +32,7 @@
 #include "file.h"
 
 #ifndef        lint
-FILE_RCSID("@(#)$File: apprentice.c,v 1.237 2015/09/11 17:24:09 christos Exp $")
+FILE_RCSID("@(#)$File: apprentice.c,v 1.238 2015/09/12 18:10:42 christos Exp $")
 #endif /* lint */
 
 #include "magic.h"
@@ -2561,12 +2561,14 @@ getvalue(struct magic_set *ms, struct magic *m, const char **p, int action)
        case FILE_LEFLOAT:
                if (m->reln != 'x') {
                        char *ep;
+                       errno = 0;
 #ifdef HAVE_STRTOF
                        m->value.f = strtof(*p, &ep);
 #else
                        m->value.f = (float)strtod(*p, &ep);
 #endif
-                       *p = ep;
+                       if (errno == 0)
+                               *p = ep;
                }
                return 0;
        case FILE_DOUBLE:
@@ -2574,17 +2576,22 @@ getvalue(struct magic_set *ms, struct magic *m, const char **p, int action)
        case FILE_LEDOUBLE:
                if (m->reln != 'x') {
                        char *ep;
+                       errno = 0;
                        m->value.d = strtod(*p, &ep);
-                       *p = ep;
+                       if (errno == 0)
+                               *p = ep;
                }
                return 0;
        default:
                if (m->reln != 'x') {
                        char *ep;
+                       errno = 0;
                        m->value.q = file_signextend(ms, m,
                            (uint64_t)strtoull(*p, &ep, 0));
-                       *p = ep;
-                       eatsize(p);
+                       if (errno == 0) {
+                               *p = ep;
+                               eatsize(p);
+                       }
                }
                return 0;
        }
@@ -2620,6 +2627,7 @@ getstr(struct magic_set *ms, struct magic *m, const char *s, int warn)
                        case '\0':
                                if (warn)
                                        file_magwarn(ms, "incomplete escape");
+                               s--;
                                goto out;
 
                        case '\t':