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Enable serial input on simulated console devices #129

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Enable serial input on simulated console devices #129

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70 changes: 70 additions & 0 deletions simio/simio_console.c
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Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,9 @@ struct console {

/* File output */
FILE *file;

/* File input */
FILE *infile;
};

static struct simio_device *console_create(char **arg_text)
Expand Down Expand Up @@ -65,6 +68,10 @@ static void console_destroy(struct simio_device *dev)
fclose(c->file);
}

if (c->infile != NULL) {
fclose(c->infile);
}

free(c);
}

Expand All @@ -76,6 +83,10 @@ static void console_reset(struct simio_device *dev)
if (c->file != NULL) {
rewind(c->file);
}

if (c->infile != NULL) {
rewind(c->infile);
}
}

static int config_addr(address_t *addr, char **arg_text)
Expand Down Expand Up @@ -118,6 +129,29 @@ static int config_output(FILE **file, char **arg_text)
return 0;
}

static int config_input(FILE **file, char **arg_text)
{
char *path = get_arg(arg_text);

if (path == NULL) {
printc_err("console: config: expected path\n");
return -1;
}

// don't leak the descriptor if configured multiple times
if ((*file != NULL) && (*file != stdin)) {
fclose(*file);
}

*file = fopen(path, "r");
if (*file == NULL) {
printc_err("console: can't open %s for reading\n", path);
return -1;
}

return 0;
}

static int console_config(struct simio_device *dev,
const char *param, char **arg_text)
{
Expand All @@ -129,6 +163,9 @@ static int console_config(struct simio_device *dev,
else if (!strcasecmp(param, "output")) {
return config_output(&c->file, arg_text);
}
else if (!strcasecmp(param, "input")) {
return config_input(&c->infile, arg_text);
}

printc_err("console: config: unknown parameter: %s\n", param);
return -1;
Expand Down Expand Up @@ -177,6 +214,36 @@ static int console_write_b(struct simio_device *dev,

return 1;
}
static int console_read_b(struct simio_device *dev,
address_t addr, uint8_t *datap)
{
struct console *c = (struct console *)dev;

if (addr != c->base_addr) {
return 1;
}

// read either from file or buffer
if (c->infile != NULL)
{
size_t nbytes = sizeof(*datap);
if (fread(datap, nbytes, 1, c->infile) != nbytes) {
printc_err("console: read error\n");
return -1;
}
// printc_err("got %c\n", *datap);
}
else // buffer
{
*datap = c->buffer[c->buffer_offset++];
if (*datap == '\n' || c->buffer_offset == sizeof c->buffer)
{
c->buffer_offset = 0;
}
}

return 1;
}

const struct simio_class simio_console = {
.name = "console",
Expand All @@ -188,6 +255,8 @@ const struct simio_class simio_console = {
" Set the peripheral base address. Defaults to 0x00FF\n"
" output <path>\n"
" Print to file instead of a buffer.\n"
" input <path>\n"
" Read from file instead of a buffer.\n"
"\n",

.create = console_create,
Expand All @@ -196,4 +265,5 @@ const struct simio_class simio_console = {
.config = console_config,
.info = console_info,
.write_b = console_write_b,
.read_b = console_read_b,
};