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vfs: semihost driver bugfix

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This commit is contained in:
Andrei Gramakov
2020-04-08 15:41:12 +02:00
parent ef47839628
commit 283026a761
2 changed files with 3 additions and 3 deletions
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4
components/vfs/vfs_semihost.c
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@@ -223,7 +223,7 @@ static ssize_t vfs_semihost_write(void* ctx, int fd, const void * data, size_t s
if (ret == -1) { if (ret == -1) {
errno = host_err; errno = host_err;
} }
return (ssize_t)ret; return size - (ssize_t)ret; /* Write syscall returns the number of bytes NOT written */
} }
static ssize_t vfs_semihost_read(void* ctx, int fd, void* data, size_t size) static ssize_t vfs_semihost_read(void* ctx, int fd, void* data, size_t size)
@@ -237,7 +237,7 @@ static ssize_t vfs_semihost_read(void* ctx, int fd, void* data, size_t size)
errno = host_err; errno = host_err;
return ret; return ret;
} }
return size - (ssize_t)ret; /* Write syscall returns the number of bytes NOT written */ return size - (ssize_t)ret; /* Read syscall returns the number of bytes NOT read */
} }

2
examples/storage/semihost_vfs/main/semihost_vfs_example_main.c
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@@ -39,7 +39,7 @@ void app_main(void)
return; return;
} }
// Increase file buffer to perform data transfers using larger chunks. // Increase file buffer to perform data transfers using larger chunks.
// Every read/write triggers breakpoint, so transfering of small chunks is quite inefficient. // Every read/write triggers breakpoint, so transferring of small chunks is quite inefficient.
setvbuf(fout, (char *)s_buf, _IOFBF, sizeof(s_buf)); setvbuf(fout, (char *)s_buf, _IOFBF, sizeof(s_buf));
// this will be printed to the file on host // this will be printed to the file on host