gcc4 warnings: fix char* signedness

diff -p -u -r1.7 block-vpc.c
@@ -81,7 +81,7 @@ typedef struct BDRVVPCState {
 
 static int vpc_probe(const uint8_t *buf, int buf_size, const char *filename)
 {
-    if (buf_size >= 8 && !strncmp(buf, "conectix", 8))
+    if (buf_size >= 8 && !strncmp((char *)buf, "conectix", 8))
 	return 100;
     return 0;
 }

diff -p -u -r1.13 block-vvfat.c
@@ -565,7 +565,7 @@ static inline uint32_t fat_get(BDRVVVFAT
 	uint16_t* entry=array_get(&(s->fat),cluster);
 	return le16_to_cpu(*entry);
     } else {
-	const uint8_t* x=s->fat.pointer+cluster*3/2;
+	const uint8_t* x=(uint8_t*)(s->fat.pointer)+cluster*3/2;
 	return ((x[0]|(x[1]<<8))>>(cluster&1?4:0))&0x0fff;
     }
 }

@@ -626,7 +626,7 @@ static inline direntry_t* create_short_a
 
     entry=array_get_next(&(s->directory));
     memset(entry->name,0x20,11);
-    strncpy(entry->name,filename,i);
+    strncpy((char*)entry->name,filename,i);
 
     if(j > 0)
 	for (i = 0; i < 3 && filename[j+1+i]; i++)

@@ -868,7 +868,7 @@ static int init_directories(BDRVVVFATSta
     {
 	direntry_t* entry=array_get_next(&(s->directory));
 	entry->attributes=0x28; /* archive | volume label */
-	snprintf(entry->name,11,"QEMU VVFAT");
+	snprintf((char*)entry->name,11,"QEMU VVFAT");
     }
 
     /* Now build FAT, and write back information into directory */

@@ -1187,7 +1187,7 @@ static inline int read_cluster(BDRVVVFAT
 		s->current_mapping = mapping;
 read_cluster_directory:
 		offset = s->cluster_size*(cluster_num-s->current_mapping->begin);
-		s->cluster = s->directory.pointer+offset
+		s->cluster = (unsigned char*)s->directory.pointer+offset
 			+ 0x20*s->current_mapping->info.dir.first_dir_index;
 		assert(((s->cluster-(unsigned char*)s->directory.pointer)%s->cluster_size)==0);
 		assert((char*)s->cluster+s->cluster_size <= s->directory.pointer+s->directory.next*s->directory.item_size);

@@ -1457,7 +1457,7 @@ static int parse_long_name(long_file_nam
     }
 
     if (pointer[0] & 0x40)
-	lfn->len = offset + strlen(lfn->name + offset);
+	lfn->len = offset + strlen((char*)lfn->name + offset);
 
     return 0;
 }

@@ -1496,7 +1496,7 @@ static int parse_short_name(BDRVVVFATSta
     } else
 	lfn->name[i + j + 1] = '\0';
 
-    lfn->len = strlen(lfn->name);
+    lfn->len = strlen((char*)lfn->name);
 
     return 0;
 }

@@ -1792,8 +1792,8 @@ DLOG(fprintf(stderr, "check direntry %d:
 		    fprintf(stderr, "Error in short name (%d)\n", subret);
 		    goto fail;
 		}
-		if (subret > 0 || !strcmp(lfn.name, ".")
-			|| !strcmp(lfn.name, ".."))
+		if (subret > 0 || !strcmp((char*)lfn.name, ".")
+			|| !strcmp((char*)lfn.name, ".."))
 		    continue;
 	    }
 	    lfn.checksum = 0x100; /* cannot use long name twice */

@@ -1802,7 +1802,7 @@ DLOG(fprintf(stderr, "check direntry %d:
 		fprintf(stderr, "Name too long: %s/%s\n", path, lfn.name);
 		goto fail;
 	    }
-	    strcpy(path2 + path_len + 1, lfn.name);
+	    strcpy(path2 + path_len + 1, (char*)lfn.name);
 
 	    if (is_directory(direntries + i)) {
 		if (begin_of_direntry(direntries + i) == 0) {

@@ -2234,7 +2234,7 @@ static int commit_one_file(BDRVVVFATStat
 	assert(size >= 0);
 
 	ret = vvfat_read(s->bs, cluster2sector(s, c),
-	    cluster, (rest_size + 0x1ff) / 0x200);
+	    (uint8_t*)cluster, (rest_size + 0x1ff) / 0x200);
 
 	if (ret < 0)
 	    return ret;

diff -p -u -r1.71 gdbstub.c
@@ -209,7 +209,7 @@ static int put_packet(GDBState *s, char 
         *(p++) = tohex((csum) & 0xf);
 
         s->last_packet_len = p - s->last_packet;
-        put_buffer(s, s->last_packet, s->last_packet_len);
+        put_buffer(s, (uint8_t *)s->last_packet, s->last_packet_len);
 
 #ifdef CONFIG_USER_ONLY
         i = get_char(s);

@@ -1189,7 +1189,7 @@ static void gdb_read_byte(GDBState *s, i
 #ifdef DEBUG_GDB
             printf("Got NACK, retransmitting\n");
 #endif
-            put_buffer(s, s->last_packet, s->last_packet_len);
+            put_buffer(s, (uint8_t *)s->last_packet, s->last_packet_len);
         }
 #ifdef DEBUG_GDB
         else if (ch == '+')

diff -p -u -r1.96 pc.c
@@ -552,7 +552,7 @@ static void load_linux(const char *kerne
 	initrd_max = ram_size-ACPI_DATA_SIZE-1;
 
     /* kernel command line */
-    pstrcpy(cmdline_addr, 4096, kernel_cmdline);
+    pstrcpy((char*)cmdline_addr, 4096, kernel_cmdline);
 
     if (protocol >= 0x202) {
 	stl_p(header+0x228, cmdline_addr-phys_ram_base);

diff -p -u -r1.376 vl.c
@@ -1610,7 +1610,7 @@ void qemu_chr_printf(CharDriverState *s,
     va_list ap;
     va_start(ap, fmt);
     vsnprintf(buf, sizeof(buf), fmt, ap);
-    qemu_chr_write(s, buf, strlen(buf));
+    qemu_chr_write(s, (uint8_t *)buf, strlen(buf));
     va_end(ap);
 }
 

@@ -1699,7 +1699,7 @@ static int mux_chr_write(CharDriverState
                          (secs / 60) % 60,
                          secs % 60,
                          (int)((ti / 1000000) % 1000));
-                d->drv->chr_write(d->drv, buf1, strlen(buf1));
+                d->drv->chr_write(d->drv, (uint8_t *)buf1, strlen(buf1));
             }
         }
     }

@@ -1728,15 +1728,16 @@ static void mux_print_help(CharDriverSta
         sprintf(cbuf,"\n\r");
         sprintf(ebuf,"C-%c", term_escape_char - 1 + 'a');
     } else {
-        sprintf(cbuf,"\n\rEscape-Char set to Ascii: 0x%02x\n\r\n\r", term_escape_char);
+        sprintf(cbuf,"\n\rEscape-Char set to Ascii: 0x%02x\n\r\n\r",
+            term_escape_char);
     }
-    chr->chr_write(chr, cbuf, strlen(cbuf));
+    chr->chr_write(chr, (uint8_t *)cbuf, strlen(cbuf));
     for (i = 0; mux_help[i] != NULL; i++) {
         for (j=0; mux_help[i][j] != '\0'; j++) {
             if (mux_help[i][j] == '%')
-                chr->chr_write(chr, ebuf, strlen(ebuf));
+                chr->chr_write(chr, (uint8_t *)ebuf, strlen(ebuf));
             else
-                chr->chr_write(chr, &mux_help[i][j], 1);
+                chr->chr_write(chr, (uint8_t *)&mux_help[i][j], 1);
         }
     }
 }

@@ -1755,7 +1756,7 @@ static int mux_proc_byte(CharDriverState
         case 'x':
             {
                  char *term =  "QEMU: Terminated\n\r";
-                 chr->chr_write(chr,term,strlen(term));
+                 chr->chr_write(chr,(uint8_t *)term,strlen(term));
                  exit(0);
                  break;
             }

@@ -5770,7 +5772,7 @@ static int qemu_savevm_state(QEMUFile *f
         /* ID string */
         len = strlen(se->idstr);
         qemu_put_byte(f, len);
-        qemu_put_buffer(f, se->idstr, len);
+        qemu_put_buffer(f, (uint8_t *)se->idstr, len);
 
         qemu_put_be32(f, se->instance_id);
         qemu_put_be32(f, se->version_id);

@@ -5831,7 +5833,7 @@ static int qemu_loadvm_state(QEMUFile *f
         if (qemu_ftell(f) >= end_pos)
             break;
         len = qemu_get_byte(f);
-        qemu_get_buffer(f, idstr, len);
+        qemu_get_buffer(f, (uint8_t *)idstr, len);
         idstr[len] = '\0';
         instance_id = qemu_get_be32(f);
         version_id = qemu_get_be32(f);