Fix a number of gcc 9.2 compiler warnings

include/share/safe_str.h

@@ -46,7 +46,9 @@ safe_strncat(char *dest, const char *src, size_t dest_size)
 	if (dest_size < 1)
 		return dest;
 
+	/* Assume dist has space for a term character .. */
 	ret = strncat(dest, src, dest_size - strlen (dest));
+	/* .. but set it explicitly. */
 	dest [dest_size - 1] = 0;
 
 	return ret;
@@ -60,7 +62,7 @@ safe_strncpy(char *dest, const char *src, size_t dest_size)
 	if (dest_size < 1)
 		return dest;
 
-	ret = strncpy(dest, src, dest_size);
+	ret = strncpy(dest, src, dest_size - 1);
 	dest [dest_size - 1] = 0;
 
 	return ret;

src/flac/main.c

@@ -1928,13 +1928,12 @@ int encode_file(const char *infilename, FLAC__bool is_first_file, FLAC__bool is_
 		static const char *tmp_suffix = ".tmp,fl-ac+en'c";
 		size_t dest_len = strlen(outfilename) + strlen(tmp_suffix) + 1;
 		/*@@@@ still a remote possibility that a file with this filename exists */
-		if(0 == (internal_outfilename = safe_malloc_(dest_len))) {
+		if((internal_outfilename = safe_malloc_(dest_len)) == NULL) {
 			flac__utils_printf(stderr, 1, "ERROR allocating memory for tempfile name\n");
 			conditional_fclose(encode_infile);
 			return 1;
 		}
-		safe_strncpy(internal_outfilename, outfilename, dest_len);
-		safe_strncat(internal_outfilename, tmp_suffix, dest_len);
+		snprintf(internal_outfilename, dest_len, "%s%s", outfilename, tmp_suffix);
 	}
 
 	if(input_format == FORMAT_RAW) {

src/libFLAC/metadata_iterators.c

@@ -3422,9 +3422,6 @@ FLAC__bool get_file_stats_(const char *filename, struct flac_stat_s *stats)
 
 void set_file_stats_(const char *filename, struct flac_stat_s *stats)
 {
-	FLAC__ASSERT(0 != filename);
-	FLAC__ASSERT(0 != stats);
-
 #if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE >= 200809L)
 	struct timespec srctime[2] = {};
 	srctime[0].tv_sec = stats->st_atime;
@@ -3434,6 +3431,10 @@ void set_file_stats_(const char *filename, struct flac_stat_s *stats)
 	srctime.actime = stats->st_atime;
 	srctime.modtime = stats->st_mtime;
 #endif
+
+	FLAC__ASSERT(0 != filename);
+	FLAC__ASSERT(0 != stats);
+
 	(void)flac_chmod(filename, stats->st_mode);
 	(void)flac_utime(filename, &srctime);
 #if !defined _MSC_VER && !defined __BORLANDC__ && !defined __MINGW32__

src/metaflac/utils.c

@@ -61,21 +61,22 @@ char *local_strdup(const char *source)
 
 void local_strcat(char **dest, const char *source)
 {
-	size_t ndest, nsource;
+	size_t ndest, nsource, outlen;
 
 	FLAC__ASSERT(0 != dest);
 	FLAC__ASSERT(0 != source);
 
-	ndest = *dest? strlen(*dest) : 0;
+	ndest = *dest ? strlen(*dest) : 0;
 	nsource = strlen(source);
+	outlen = ndest + nsource + 1;
 
 	if(nsource == 0)
 		return;
 
 	*dest = safe_realloc_add_3op_(*dest, ndest, /*+*/nsource, /*+*/1);
-	if(0 == *dest)
+	if(*dest == NULL)
 		die("out of memory growing string");
-	safe_strncpy((*dest)+ndest, source, nsource + 1);
+	safe_strncat(*dest, source, outlen);
 }
 
 static inline int local_isprint(int c)

src/share/utf8/iconvert.c

@@ -25,6 +25,7 @@
 #include <assert.h>
 #include <errno.h>
 #include <iconv.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ -77,18 +78,17 @@ int iconvert(const char *fromcode, const char *tocode,
       tocode[4] != '8' ||
       tocode[5] != '\0') {
     char *tocode1;
-	size_t dest_len = strlen(tocode) + 11;
+    int rc;
     /*
      * Try using this non-standard feature of glibc and libiconv.
      * This is deliberately not a config option as people often
      * change their iconv library without rebuilding applications.
      */
-    tocode1 = safe_malloc_(dest_len);
-    if (!tocode1)
+
+    rc = asprintf(&tocode1, "%s//TRANSLIT", tocode);
+    if (rc < 0 || ! tocode1)
       goto fail;
 
-    safe_strncpy(tocode1, tocode, dest_len);
-    safe_strncat(tocode1, "//TRANSLIT", dest_len);
     cd2 = iconv_open(tocode1, "UTF-8");
     free(tocode1);
 

src/share/utf8/utf8.c

@@ -29,6 +29,7 @@
 #  include <config.h>
 #endif
 
+#include <stdio.h>
 #include <stdlib.h>
 
 #include "share/alloc.h"
@@ -180,7 +181,7 @@ static int convert_string(const char *fromcode, const char *tocode,
   s = safe_malloc_add_2op_(fromlen, /*+*/1);
   if (!s)
     return -1;
-  safe_strncpy(s, from, fromlen + 1);
+  snprintf(s, fromlen + 1, "%s", from);
   *to = s;
   for (; *s; s++)
     if (*s & ~0x7f)

src/test_libFLAC/metadata_manip.c

@@ -255,9 +255,6 @@ static FLAC__bool get_file_stats_(const char *filename, struct flac_stat_s *stat
 
 static void set_file_stats_(const char *filename, struct flac_stat_s *stats)
 {
-	FLAC__ASSERT(0 != filename);
-	FLAC__ASSERT(0 != stats);
-
 #if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE >= 200809L)
 	struct timespec srctime[2] = {};
 	srctime[0].tv_sec = stats->st_atime;
@@ -267,6 +264,9 @@ static void set_file_stats_(const char *filename, struct flac_stat_s *stats)
 	srctime.actime = stats->st_atime;
 	srctime.modtime = stats->st_mtime;
 #endif
+	FLAC__ASSERT(0 != filename);
+	FLAC__ASSERT(0 != stats);
+
 	(void)flac_chmod(filename, stats->st_mode);
 	(void)flac_utime(filename, &srctime);
 #if !defined _MSC_VER && !defined __MINGW32__