util: move read_password method out of qemu-img into osdep/oslib

The qemu-img.c file has a read_password() method impl that is
used to prompt for passwords on the console, with impls for
POSIX and Windows. This will be needed by qemu-io.c too, so
move it into the QEMU osdep/oslib files where it can be shared
without code duplication

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

include/qemu/osdep.h

@@ -259,4 +259,6 @@ void qemu_set_tty_echo(int fd, bool echo);
 
 void os_mem_prealloc(int fd, char *area, size_t sz);
 
+int qemu_read_password(char *buf, int buf_size);
+
 #endif

qemu-img.c

@@ -165,97 +165,6 @@ static int GCC_FMT_ATTR(2, 3) qprintf(bool quiet, const char *fmt, ...)
     return ret;
 }
 
-#if defined(WIN32)
-/* XXX: put correct support for win32 */
-static int read_password(char *buf, int buf_size)
-{
-    int c, i;
-
-    printf("Password: ");
-    fflush(stdout);
-    i = 0;
-    for(;;) {
-        c = getchar();
-        if (c < 0) {
-            buf[i] = '\0';
-            return -1;
-        } else if (c == '\n') {
-            break;
-        } else if (i < (buf_size - 1)) {
-            buf[i++] = c;
-        }
-    }
-    buf[i] = '\0';
-    return 0;
-}
-
-#else
-
-#include <termios.h>
-
-static struct termios oldtty;
-
-static void term_exit(void)
-{
-    tcsetattr (0, TCSANOW, &oldtty);
-}
-
-static void term_init(void)
-{
-    struct termios tty;
-
-    tcgetattr (0, &tty);
-    oldtty = tty;
-
-    tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP
-                          |INLCR|IGNCR|ICRNL|IXON);
-    tty.c_oflag |= OPOST;
-    tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN);
-    tty.c_cflag &= ~(CSIZE|PARENB);
-    tty.c_cflag |= CS8;
-    tty.c_cc[VMIN] = 1;
-    tty.c_cc[VTIME] = 0;
-
-    tcsetattr (0, TCSANOW, &tty);
-
-    atexit(term_exit);
-}
-
-static int read_password(char *buf, int buf_size)
-{
-    uint8_t ch;
-    int i, ret;
-
-    printf("password: ");
-    fflush(stdout);
-    term_init();
-    i = 0;
-    for(;;) {
-        ret = read(0, &ch, 1);
-        if (ret == -1) {
-            if (errno == EAGAIN || errno == EINTR) {
-                continue;
-            } else {
-                break;
-            }
-        } else if (ret == 0) {
-            ret = -1;
-            break;
-        } else {
-            if (ch == '\r') {
-                ret = 0;
-                break;
-            }
-            if (i < (buf_size - 1))
-                buf[i++] = ch;
-        }
-    }
-    term_exit();
-    buf[i] = '\0';
-    printf("\n");
-    return ret;
-}
-#endif
 
 static int print_block_option_help(const char *filename, const char *fmt)
 {
@@ -312,7 +221,7 @@ static BlockBackend *img_open(const char *id, const char *filename,
     bs = blk_bs(blk);
     if (bdrv_is_encrypted(bs) && require_io) {
         qprintf(quiet, "Disk image '%s' is encrypted.\n", filename);
-        if (read_password(password, sizeof(password)) < 0) {
+        if (qemu_read_password(password, sizeof(password)) < 0) {
             error_report("No password given");
             goto fail;
         }

util/oslib-posix.c

@@ -50,6 +50,7 @@ extern int daemon(int, int);
 
 #include <termios.h>
 #include <unistd.h>
+#include <termios.h>
 
 #include <glib/gprintf.h>
 
@@ -415,3 +416,68 @@ void os_mem_prealloc(int fd, char *area, size_t memory)
         pthread_sigmask(SIG_SETMASK, &oldset, NULL);
     }
 }
+
+
+static struct termios oldtty;
+
+static void term_exit(void)
+{
+    tcsetattr(0, TCSANOW, &oldtty);
+}
+
+static void term_init(void)
+{
+    struct termios tty;
+
+    tcgetattr(0, &tty);
+    oldtty = tty;
+
+    tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP
+                          |INLCR|IGNCR|ICRNL|IXON);
+    tty.c_oflag |= OPOST;
+    tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN);
+    tty.c_cflag &= ~(CSIZE|PARENB);
+    tty.c_cflag |= CS8;
+    tty.c_cc[VMIN] = 1;
+    tty.c_cc[VTIME] = 0;
+
+    tcsetattr(0, TCSANOW, &tty);
+
+    atexit(term_exit);
+}
+
+int qemu_read_password(char *buf, int buf_size)
+{
+    uint8_t ch;
+    int i, ret;
+
+    printf("password: ");
+    fflush(stdout);
+    term_init();
+    i = 0;
+    for (;;) {
+        ret = read(0, &ch, 1);
+        if (ret == -1) {
+            if (errno == EAGAIN || errno == EINTR) {
+                continue;
+            } else {
+                break;
+            }
+        } else if (ret == 0) {
+            ret = -1;
+            break;
+        } else {
+            if (ch == '\r') {
+                ret = 0;
+                break;
+            }
+            if (i < (buf_size - 1)) {
+                buf[i++] = ch;
+            }
+        }
+    }
+    term_exit();
+    buf[i] = '\0';
+    printf("\n");
+    return ret;
+}

util/oslib-win32.c

@@ -470,3 +470,27 @@ void os_mem_prealloc(int fd, char *area, size_t memory)
         memset(area + pagesize * i, 0, 1);
     }
 }
+
+
+/* XXX: put correct support for win32 */
+int qemu_read_password(char *buf, int buf_size)
+{
+    int c, i;
+
+    printf("Password: ");
+    fflush(stdout);
+    i = 0;
+    for (;;) {
+        c = getchar();
+        if (c < 0) {
+            buf[i] = '\0';
+            return -1;
+        } else if (c == '\n') {
+            break;
+        } else if (i < (buf_size - 1)) {
+            buf[i++] = c;
+        }
+    }
+    buf[i] = '\0';
+    return 0;
+}