FlapJackApps/libdivecomputer
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Always prefix the port name with "\\.\" before opening the port.

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The "\\.\" prefix allows to access the Win32 device namespace directly,
without going through the file system. This is required to support
non-standard port names, and COMx ports with a number greater than 9.
This commit is contained in:
Jef Driesen 2011-01-01 22:27:02 +01:00
parent 93cc4c8d0b
commit 4fd295b4ac
1 changed files with 14 additions and 1 deletions
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15
src/serial_win32.c
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@ -91,6 +91,19 @@ serial_open (serial_t **out, const char* name)
if (out == NULL)
return -1; // ERROR_INVALID_PARAMETER (The parameter is incorrect)
// Build the device name.
const char *devname = NULL;
char buffer[MAX_PATH] = "\\\\.\\";
if (name && strncmp (name, buffer, 4) != 0) {
size_t length = strlen (name) + 1;
if (length + 4 > sizeof (buffer))
return -1;
memcpy (buffer + 4, name, length);
devname = buffer;
} else {
devname = name;
}
// Allocate memory.
serial_t *device = (serial_t *) malloc (sizeof (serial_t));
if (device == NULL) {
@ -99,7 +112,7 @@ serial_open (serial_t **out, const char* name)
}
// Open the device.
device->hFile = CreateFileA (name,
device->hFile = CreateFileA (devname,
GENERIC_READ | GENERIC_WRITE, 0,
NULL, // No security attributes.
OPEN_EXISTING,