84 lines
1.6 KiB
C
84 lines
1.6 KiB
C
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#include <argp.h>
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/* Barcodes are just strings. */
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typedef char* barcode;
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/*
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* "Linked List String", a linked list of characters.
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* The head of the list is the last character in the string.
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*/
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typedef struct ll_string {
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char character;
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struct ll_string *next;
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} ll_string;
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/*
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* Function prototypes
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*/
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error_t
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parse_opt(int key, char *arg, struct argp_state *state);
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static barcode
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await_next_barcode(int fd);
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static char
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decode_next_event(int fd);
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static void *
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Calloc(size_t size);
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static void *
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Malloc(size_t size);
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static char *
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ll_string_to_c_string(ll_string *l);
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static ll_string *
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ll_string_append(ll_string *l, char c);
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static unsigned int
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ll_string_len(ll_string *l);
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static void
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ll_string_free(ll_string *l);
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/*
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* Arguments used by the read_scan application
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*/
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typedef struct args {
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char *zmq_endpoint;
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char *dev_id;
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} args;
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/*
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* Descriptions of command line arguments we'd like to parse.
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*/
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static const struct argp_option options[] = {
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{
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.name = "zmq_endpoint",
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.key = 'e',
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.arg = "zmq_endpoint",
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.flags = 0,
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.doc = "ZeroMQ endpoint to publish barcodes",
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.group = 0
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},
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{
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.name = "dev_id",
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.key = 'd',
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.arg = "dev_id",
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.flags = 0,
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.doc = "Device id of the barcode scanner (in /dev/input/by-id)",
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.group = 0
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},
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// Need one zero-struct to terminate, per the argp spec.
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{ }
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};
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static const struct argp argp = {
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.options = options,
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.parser = parse_opt,
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.args_doc = NULL,
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.doc = "Acquire barcode data and publish to a ZeroMQ channel\v",
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.children = NULL
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};
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