init vars for coverity (formats)

src/lib/formats/ap2_dsk.h

@@ -59,7 +59,7 @@ private:
 
 	bool m_prodos_order;
 
-	int m_tracks;
+	int m_tracks = 0;
 };
 
 extern const floppy_format_type FLOPPY_A216S_FORMAT;

src/lib/formats/basicdsk.cpp

@@ -290,7 +290,7 @@ static floperr_t basicdsk_get_indexed_sector_info(floppy_image_legacy *floppy, i
 
 static void basicdsk_default_geometry(const struct FloppyFormat *format, struct basicdsk_geometry *geometry)
 {
-	int sector_length;
+	int sector_length = 0;
 	memset(geometry, 0, sizeof(*geometry));
 
 	auto err = util::option_resolution::get_default(format->param_guidelines, PARAM_HEADS,           &geometry->heads);

src/lib/formats/flex_dsk.h

@@ -28,21 +28,21 @@ public:
 private:
 	struct sysinfo_sector
 	{
-		uint8_t unused1[16];
-		uint8_t disk_name[8];
-		uint8_t disk_ext[3];
-		uint8_t disk_number[2];
-		uint8_t fc_start_trk;
-		uint8_t fc_start_sec;
-		uint8_t fc_end_trk;
-		uint8_t fc_end_sec;
-		uint8_t free[2];
-		uint8_t month;
-		uint8_t day;
-		uint8_t year;
-		uint8_t last_trk;
-		uint8_t last_sec;
-		uint8_t unused2[216];
+		uint8_t unused1[16]{};
+		uint8_t disk_name[8]{};
+		uint8_t disk_ext[3]{};
+		uint8_t disk_number[2]{};
+		uint8_t fc_start_trk = 0;
+		uint8_t fc_start_sec = 0;
+		uint8_t fc_end_trk = 0;
+		uint8_t fc_end_sec = 0;
+		uint8_t free[2]{};
+		uint8_t month = 0;
+		uint8_t day = 0;
+		uint8_t year = 0;
+		uint8_t last_trk = 0;
+		uint8_t last_sec = 0;
+		uint8_t unused2[216]{};
 	} info;
 	static const format formats[];
 	static const format formats_head1[];

src/lib/formats/flopimg.cpp

@@ -2194,7 +2194,7 @@ std::vector<std::vector<uint8_t>> floppy_image_format_t::extract_sectors_from_bi
 		return sectors;
 
 	// Start by detecting all id and data blocks
-	uint32_t hblk[100], dblk[100];
+	uint32_t hblk[100]{}, dblk[100]{};
 	uint32_t hblk_count = 0, dblk_count = 0;
 
 	// Precharge the shift register to detect over-the-index stuff
@@ -2276,7 +2276,7 @@ std::vector<std::vector<uint8_t>> floppy_image_format_t::extract_sectors_from_bi
 		return sectors;
 
 	// Start by detecting all id and data blocks
-	uint32_t hblk[100], dblk[100];
+	uint32_t hblk[100]{}, dblk[100]{};
 	uint32_t hblk_count = 0, dblk_count = 0;
 
 	// Precharge the shift register to detect over-the-index stuff

src/lib/formats/imd_dsk.h

@@ -40,7 +40,7 @@ private:
 	std::vector<uint8_t> m_sector_count;
 	std::vector<uint8_t> m_ssize;
 
-	int m_trackmult;
+	int m_trackmult = 1;
 };
 
 extern const floppy_format_type FLOPPY_IMD_FORMAT;

src/lib/formats/mfm_hd.h

@@ -55,30 +55,30 @@ public:
 	// could be changed, but we do not support this (yet). These are defined
 	// in the CHD and must match those of the device. They are stored by the GDDD tag.
 	// The encoding is not stored in the CHD but is also supposed to be immutable.
-	int     cylinders;
-	int     heads;
-	int     sectors_per_track;
-	int     sector_size;
+	int     cylinders = 0;
+	int     heads = 0;
+	int     sectors_per_track = 0;
+	int     sector_size = 0;
 	mfmhd_enc_t     encoding;
 
 	// Parameters like interleave, precompensation, write current can be changed
 	// on every write operation. They are stored by the GDDI tag (first record).
-	int     interleave;
-	int     cylskew;
-	int     headskew;
-	int     write_precomp_cylinder;     // if -1, no wpcom on the disks
-	int     reduced_wcurr_cylinder;     // if -1, no rwc on the disks
+	int     interleave = 0;
+	int     cylskew = 0;
+	int     headskew = 0;
+	int     write_precomp_cylinder = 0;     // if -1, no wpcom on the disks
+	int     reduced_wcurr_cylinder = 0;     // if -1, no rwc on the disks
 
 	// Parameters for the track layout that are supposed to be the same for
 	// all tracks and that do not change (until the next reformat).
 	// Also, they do not have any influence on the CHD file.
 	// They are stored by the GDDI tag (second record).
-	int     gap1;
-	int     gap2;
-	int     gap3;
-	int     sync;
-	int     headerlen;
-	int     ecctype;        // -1 is CRC
+	int     gap1 = 0;
+	int     gap2 = 0;
+	int     gap3 = 0;
+	int     sync = 0;
+	int     headerlen = 0;
+	int     ecctype = 0;        // -1 is CRC
 
 	bool sane_rec() const
 	{

src/lib/formats/td0_dsk.cpp

@@ -51,11 +51,11 @@ struct td0dsk_tag
 };
 
 struct tdlzhuf {
-	uint16_t r,
-					bufcnt,bufndx,bufpos,  // string buffer
+	uint16_t r = 0,
+					bufcnt = 0, bufndx = 0, bufpos = 0,  // string buffer
 				// the following to allow block reads from input in next_word()
-					ibufcnt,ibufndx; // input buffer counters
-	uint8_t  inbuf[BUFSZ];    // input buffer
+					ibufcnt = 0, ibufndx = 0; // input buffer counters
+	uint8_t  inbuf[BUFSZ]{};    // input buffer
 };