118 lines
3 KiB
C
118 lines
3 KiB
C
#pragma once
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#include <stdio.h>
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#define READOPT_ALLOC_STRINGS(...) ((char *[]){__VA_ARGS__, NULL})
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enum readopt_error {
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READOPT_ERROR_SUCCESS,
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READOPT_ERROR_NOVAL,
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READOPT_ERROR_NOTREQ,
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READOPT_ERROR_NOTOPT,
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READOPT_ERROR_RANGEOPT,
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READOPT_ERROR_RANGEOPER
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};
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enum readopt_form {
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READOPT_FORM_SHORT,
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READOPT_FORM_LONG
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};
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enum readopt_format {
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READOPT_FORMAT_PLAIN,
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READOPT_FORMAT_MDOC,
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};
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struct readopt_view_strings {
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const char **strings;
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size_t len;
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};
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struct readopt_bounds {
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/* upper val will be ignored if inf is non-zero */
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size_t val[2];
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int inf;
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};
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struct readopt_oper {
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char *name;
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struct readopt_bounds bounds;
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struct readopt_view_strings val;
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};
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struct readopt_opt {
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/* two null-terminated arrays of either long or short option names */
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char **names[2];
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struct {
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int req;
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/* oper.name is the name of the value itself (not the option), such as "file" in "--config=file" */
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struct readopt_oper oper;
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} cont;
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};
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struct readopt_parser {
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struct readopt_opt *opts;
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struct readopt_oper *opers;
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struct readopt_view_strings args;
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struct {
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int pending;
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const char *grppos;
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struct {
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struct readopt_opt *opt;
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/* reference to the current argument being parsed */
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const char **arg;
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/* reference to the last element of the option/operand value view */
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const char **eoval;
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/* intermediate operands which have not yet been assigned */
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struct readopt_view_strings ioper;
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} curr;
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} state;
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enum readopt_error error;
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};
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struct readopt_write_context {
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size_t written;
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void *additional;
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struct {
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FILE *stream;
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size_t size;
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} dest;
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struct {
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const char *payload;
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size_t len;
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} src;
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/* returning 0 means that the current string will not be written */
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int (*callback)(struct readopt_write_context *);
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};
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struct readopt_format_context {
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enum readopt_format fmt;
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struct {
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const char *needles;
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char pre;
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} esc;
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struct readopt_write_context *wr;
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};
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/* iteratively parse the arguments */
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int readopt_parse(struct readopt_parser *rp);
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/* args should always exclude the first element, like this: {.strings = argv + 1, .len = argc - 1} */
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void readopt_parser_init(struct readopt_parser *rp, struct readopt_opt *opts, struct readopt_oper *opers, struct readopt_view_strings args);
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/* check whether the argument is a valid option (can be used to check for the end of an array of options) */
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int readopt_validate_opt(struct readopt_opt *opt);
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/* check whether the argument is a valid operand (can be used to check for the end of an array of operands) */
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int readopt_validate_oper(struct readopt_oper *oper);
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/* check whether the operand's values are within the defined limits */
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int readopt_validate_within(struct readopt_oper *oper);
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/* get the upper limit */
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size_t readopt_select_upper(struct readopt_bounds bounds);
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/* get the lower limit (this does not always return the minimum, if e.g. .val is {0, 1} and inf != 0, then 1 will be considered the lower limit as well as the upper limit) */
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size_t readopt_select_lower(struct readopt_bounds bounds);
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