Change esp_vfs_t.write return value to ssize_t

write() should return ssize_t, not size_t.

components/fatfs/src/vfs_fat.c

@@ -45,7 +45,7 @@ typedef struct {
 
 static const char* TAG = "vfs_fat";
 
-static size_t vfs_fat_write(void* p, int fd, const void * data, size_t size);
+static ssize_t vfs_fat_write(void* p, int fd, const void * data, size_t size);
 static off_t vfs_fat_lseek(void* p, int fd, off_t size, int mode);
 static ssize_t vfs_fat_read(void* ctx, int fd, void * dst, size_t size);
 static int vfs_fat_open(void* ctx, const char * path, int flags, int mode);
@@ -290,7 +290,7 @@ out:
     return fd;
 }
 
-static size_t vfs_fat_write(void* ctx, int fd, const void * data, size_t size)
+static ssize_t vfs_fat_write(void* ctx, int fd, const void * data, size_t size)
 {
     vfs_fat_ctx_t* fat_ctx = (vfs_fat_ctx_t*) ctx;
     FIL* file = &fat_ctx->files[fd];

components/vfs/README.rst

@@ -31,7 +31,7 @@ Depending on the way FS driver declares its APIs, either ``read``, ``write``, et
 
 Case 1: API functions are declared without an extra context pointer (FS driver is a singleton)::
 
-    size_t myfs_write(int fd, const void * data, size_t size);
+    ssize_t myfs_write(int fd, const void * data, size_t size);
 
     // In definition of esp_vfs_t:
         .flags = ESP_VFS_FLAG_DEFAULT,
@@ -43,7 +43,7 @@ Case 1: API functions are declared without an extra context pointer (FS driver i
 
 Case 2: API functions are declared with an extra context pointer (FS driver supports multiple instances)::
 
-    size_t myfs_write(myfs_t* fs, int fd, const void * data, size_t size);
+    ssize_t myfs_write(myfs_t* fs, int fd, const void * data, size_t size);
 
     // In definition of esp_vfs_t:
         .flags = ESP_VFS_FLAG_CONTEXT_PTR,

components/vfs/include/esp_vfs.h

@@ -69,8 +69,8 @@ typedef struct
     int fd_offset;  /*!< file descriptor offset, determined by the FS driver */
     int flags;      /*!< ESP_VFS_FLAG_CONTEXT_PTR or ESP_VFS_FLAG_DEFAULT */
     union {
-        size_t (*write_p)(void* p, int fd, const void * data, size_t size);
-        size_t (*write)(int fd, const void * data, size_t size);
+        ssize_t (*write_p)(void* p, int fd, const void * data, size_t size);
+        ssize_t (*write)(int fd, const void * data, size_t size);
     };
     union {
         off_t (*lseek_p)(void* p, int fd, off_t size, int mode);

components/vfs/vfs.c

@@ -213,7 +213,7 @@ ssize_t esp_vfs_write(struct _reent *r, int fd, const void * data, size_t size)
         return -1;
     }
     int local_fd = translate_fd(vfs, fd);
-    int ret;
+    ssize_t ret;
     CHECK_AND_CALL(ret, r, vfs, write, local_fd, data, size);
     return ret;
 }
@@ -226,7 +226,7 @@ off_t esp_vfs_lseek(struct _reent *r, int fd, off_t size, int mode)
         return -1;
     }
     int local_fd = translate_fd(vfs, fd);
-    int ret;
+    off_t ret;
     CHECK_AND_CALL(ret, r, vfs, lseek, local_fd, size, mode);
     return ret;
 }
@@ -239,7 +239,7 @@ ssize_t esp_vfs_read(struct _reent *r, int fd, void * dst, size_t size)
         return -1;
     }
     int local_fd = translate_fd(vfs, fd);
-    int ret;
+    ssize_t ret;
     CHECK_AND_CALL(ret, r, vfs, read, local_fd, dst, size);
     return ret;
 }

components/vfs/vfs_uart.c

@@ -47,7 +47,7 @@ static void IRAM_ATTR uart_tx_char(uart_dev_t* uart, int c)
 }
 
 
-static size_t IRAM_ATTR uart_write(int fd, const void * data, size_t size)
+static ssize_t IRAM_ATTR uart_write(int fd, const void * data, size_t size)
 {
     assert(fd >=0 && fd < 3);
     const char *data_c = (const char *)data;