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[libc][keil] fix the bug of _sys_read and _sys_write

This commit is contained in:
Meco Man 2021-12-01 02:19:15 -05:00
parent 43ebe094e3
commit 7b1f65a690
1 changed files with 12 additions and 4 deletions
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16
components/libc/compilers/armlibc/syscalls.c
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@ -156,23 +156,27 @@ int _sys_read(FILEHANDLE fh, unsigned char *buf, unsigned len, int mode)
return 0; /* error, but keep going */
}
size = read(STDIN_FILENO, buf, len);
return 0; /* success */
return len - size; /* success */
#else
return 0; /* error */
#endif /* RT_USING_POSIX_DEVIO */
}
else if (fh == STDOUT || fh == STDERR)
{
return 0; /* error */
return -1; /* 100% error */
}
else
{
size = read(fh, buf, len);
if (size >= 0)
{
return len - size; /* success */
}
else
{
return 0; /* error */
}
}
#else
return 0; /* error */
#endif /* DFS_USING_POSIX */
@ -209,16 +213,20 @@ int _sys_write(FILEHANDLE fh, const unsigned char *buf, unsigned len, int mode)
}
else if (fh == STDIN)
{
return 0; /* error */
return -1; /* 100% error */
}
else
{
#ifdef DFS_USING_POSIX
size = write(fh, buf, len);
if (size >= 0)
return 0; /* success */
{
return len - size; /* success */
}
else
{
return 0; /* error */
}
#else
return 0; /* error */
#endif /* DFS_USING_POSIX */