Fix trivial coding style nits in a_time/a_tm files

Clean up some true/false returns
Reviewed-by: NAndy Polyakov <appro@openssl.org>
Reviewed-by: NPaul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/4001)

crypto/asn1/a_gentm.c

@@ -23,7 +23,7 @@ int asn1_generalizedtime_to_tm(struct tm *tm, const ASN1_GENERALIZEDTIME *d)
     if (d->type != V_ASN1_GENERALIZEDTIME)
         return 0;
     return asn1_time_to_tm(tm, d);
- }
+}
 
 int ASN1_GENERALIZEDTIME_check(const ASN1_GENERALIZEDTIME *d)
 {
@@ -45,9 +45,9 @@ int ASN1_GENERALIZEDTIME_set_string(ASN1_GENERALIZEDTIME *s, const char *str)
                 return 0;
             s->type = V_ASN1_GENERALIZEDTIME;
         }
-        return (1);
-    } else
-        return (0);
+        return 1;
+    }
+    return 0;
 }
 
 ASN1_GENERALIZEDTIME *ASN1_GENERALIZEDTIME_set(ASN1_GENERALIZEDTIME *s,
@@ -108,7 +108,7 @@ ASN1_GENERALIZEDTIME *ASN1_GENERALIZEDTIME_adj(ASN1_GENERALIZEDTIME *s,
     return NULL;
 }
 
-const char *_asn1_mon[12] = {
+static const char _asn1_mon[12][4] = {
     "Jan", "Feb", "Mar", "Apr", "May", "Jun",
     "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
 };
@@ -154,13 +154,10 @@ int ASN1_GENERALIZEDTIME_print(BIO *bp, const ASN1_GENERALIZEDTIME *tm)
         }
     }
 
-    if (BIO_printf(bp, "%s %2d %02d:%02d:%02d%.*s %d%s",
-                   _asn1_mon[M - 1], d, h, m, s, f_len, f, y,
-                   (gmt) ? " GMT" : "") <= 0)
-        return (0);
-    else
-        return (1);
+    return BIO_printf(bp, "%s %2d %02d:%02d:%02d%.*s %d%s",
+                      _asn1_mon[M - 1], d, h, m, s, f_len, f, y,
+                      (gmt) ? " GMT" : "") > 0;
  err:
     BIO_write(bp, "Bad time value", 14);
-    return (0);
+    return 0;
 }

crypto/asn1/a_time.c

@@ -297,8 +297,9 @@ ASN1_GENERALIZEDTIME *ASN1_TIME_to_generalizedtime(const ASN1_TIME *t,
     if (out == NULL || *out == NULL) {
         if ((ret = ASN1_GENERALIZEDTIME_new()) == NULL)
             goto err;
-    } else
+    } else {
         ret = *out;
+    }
 
     /* If already GeneralizedTime just copy across */
     if (t->type == V_ASN1_GENERALIZEDTIME) {
@@ -349,7 +350,7 @@ int ASN1_TIME_set_string(ASN1_TIME *s, const char *str)
             return 0;
     }
 
-    if (s && !ASN1_STRING_copy((ASN1_STRING *)s, (ASN1_STRING *)&t))
+    if (s != NULL && !ASN1_STRING_copy((ASN1_STRING *)s, (ASN1_STRING *)&t))
         return 0;
 
     return 1;
@@ -421,7 +422,7 @@ int ASN1_TIME_to_tm(const ASN1_TIME *s, struct tm *tm)
 
         time(&now_t);
         memset(tm, 0, sizeof(*tm));
-        if (OPENSSL_gmtime(&now_t, tm))
+        if (OPENSSL_gmtime(&now_t, tm) != NULL)
             return 1;
         return 0;
     }
@@ -448,5 +449,5 @@ int ASN1_TIME_print(BIO *bp, const ASN1_TIME *tm)
     if (tm->type == V_ASN1_GENERALIZEDTIME)
         return ASN1_GENERALIZEDTIME_print(bp, tm);
     BIO_write(bp, "Bad time value", 14);
-    return (0);
+    return 0;
 }

crypto/asn1/a_utctm.c

@@ -112,7 +112,7 @@ int ASN1_UTCTIME_cmp_time_t(const ASN1_UTCTIME *s, time_t t)
     if (!asn1_utctime_to_tm(&stm, s))
         return -2;
 
-    if (!OPENSSL_gmtime(&t, &ttm))
+    if (OPENSSL_gmtime(&t, &ttm) == NULL)
         return -2;
 
     if (!OPENSSL_gmtime_diff(&day, &sec, &ttm, &stm))
@@ -129,6 +129,11 @@ int ASN1_UTCTIME_cmp_time_t(const ASN1_UTCTIME *s, time_t t)
     return 0;
 }
 
+static const char _asn1_mon[12][4] = {
+    "Jan", "Feb", "Mar", "Apr", "May", "Jun",
+    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+};
+
 int ASN1_UTCTIME_print(BIO *bp, const ASN1_UTCTIME *tm)
 {
     const char *v;
@@ -159,11 +164,9 @@ int ASN1_UTCTIME_print(BIO *bp, const ASN1_UTCTIME *tm)
         (v[10] >= '0') && (v[10] <= '9') && (v[11] >= '0') && (v[11] <= '9'))
         s = (v[10] - '0') * 10 + (v[11] - '0');
 
-    if (BIO_printf(bp, "%s %2d %02d:%02d:%02d %d%s",
-                   _asn1_mon[M - 1], d, h, m, s, y + 1900,
-                   (gmt) ? " GMT" : "") <= 0)
-        return 0;
-    return 1;
+    return BIO_printf(bp, "%s %2d %02d:%02d:%02d %d%s",
+                      _asn1_mon[M - 1], d, h, m, s, y + 1900,
+                      (gmt) ? " GMT" : "") > 0;
  err:
     BIO_write(bp, "Bad time value", 14);
     return 0;

crypto/asn1/asn1_locl.h

@@ -43,9 +43,6 @@ DEFINE_STACK_OF(MIME_PARAM)
 typedef struct mime_header_st MIME_HEADER;
 DEFINE_STACK_OF(MIME_HEADER)
 
-/* Month values for printing out times */
-extern const char *_asn1_mon[12];
-
 void asn1_string_embed_free(ASN1_STRING *a, int embed);
 
 int asn1_get_choice_selector(ASN1_VALUE **pval, const ASN1_ITEM *it);