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Improve options handling

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This commit is contained in:
Kamil Trzcinski
2022-07-12 21:49:49 +02:00
parent 18be13ccc9
commit 1857cd8d77
4 changed files with 103 additions and 37 deletions
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70
opts/opts.c
View File

@ -5,29 +5,75 @@
#include <stdio.h>
#include <limits.h>
static void print_help(option_t *options)
#define OPT_LENGTH 30
static void print_help(option_t *options, const char *cmd)
{
printf("Usage:\n");
printf("$ %s <options...>\n", cmd);
printf("\n");
printf("Options:\n");
for (int i = 0; options[i].name; i++) {
option_t *option = &options[i];
int len = 0;
printf("%40s\t", option->name);
len += printf(" -%s", option->name);
if (option->default_value) {
len += printf("[=%s]", option->default_value);
} else if (option->value_mapping) {
len += printf("=arg");
} else {
len += printf("=%s", option->format);
}
if (len < OPT_LENGTH) {
printf("%*s", OPT_LENGTH-len, " ");
}
printf("- %s", option->description);
if (option->value_mapping) {
printf(" Values: ");
for (int j = 0; option->value_mapping[j].name; j++) {
if (j > 0) printf(", ");
printf("%s", option->value_mapping[j].name);
}
printf(".");
}
printf("\n");
}
printf("\n");
printf("Configuration:\n");
for (int i = 0; options[i].name; i++) {
option_t *option = &options[i];
int len = 0;
if (option->value_list) {
char *string = option->value_list;
char *token;
int tokens = 0;
if (!*string)
continue;
while ((token = strsep(&string, OPTION_VALUE_LIST_SEP)) != NULL) {
if (tokens++ > 0)
printf("\n%40s\t", "");
printf("%s", token);
len = printf(" -%s=", option->name);
if (len < OPT_LENGTH) {
printf("%*s", OPT_LENGTH-len, " ");
}
printf("%s\n", token);
}
if (!tokens)
printf("(none)");
} else if (option->value_string) {
len += printf(" -%s=", option->name);
if (len < OPT_LENGTH) {
printf("%*s", OPT_LENGTH-len, " ");
}
printf(option->format, option->value_string);
printf("\n");
} else {
len += printf(" -%s=", option->name);
if (len < OPT_LENGTH) {
printf("%*s", OPT_LENGTH-len, " ");
}
if (option->value_mapping) {
for (int j = 0; option->value_mapping[j].name; j++) {
if (option->value_mapping[j].value == *option->value) {
@ -39,10 +85,10 @@ static void print_help(option_t *options)
unsigned mask = UINT_MAX >> ((sizeof(*option->value) - option->size) * 8);
printf(option->format, *option->value & mask);
printf("\n");
}
printf("\n");
}
printf("\n");
}
static int parse_opt(option_t *options, const char *key)
@ -116,7 +162,7 @@ int parse_opts(option_t *options, int argc, char *argv[])
}
if (!strcmp(key, "help")) {
print_help(options);
print_help(options, argv[0]);
return -1;
}

13
opts/opts.h
View File

@ -23,6 +23,7 @@ typedef struct options_s {
option_value_t *value_mapping;
unsigned size;
const char *default_value;
const char *description;
} option_t;
#define OPTION_VALUE_LIST_SEP ";"
@ -34,38 +35,42 @@ typedef struct options_s {
#define OPTION_FORMAT_string "%s"
#define OPTION_FORMAT_list "%s"
#define DEFINE_OPTION(_section, _name, _type) \
#define DEFINE_OPTION(_section, _name, _type, _desc) \
{ \
.name = #_section "-" #_name, \
.value_##_type = &_section##_options._name, \
.format = OPTION_FORMAT_##_type, \
.size = sizeof(_section##_options._name), \
.description = _desc, \
}
#define DEFINE_OPTION_DEFAULT(_section, _name, _type, _default_value) \
#define DEFINE_OPTION_DEFAULT(_section, _name, _type, _default_value, _desc) \
{ \
.name = #_section "-" #_name, \
.value_##_type = &_section##_options._name, \
.format = OPTION_FORMAT_##_type, \
.size = sizeof(_section##_options._name), \
.default_value = _default_value, \
.description = _desc, \
}
#define DEFINE_OPTION_VALUES(_section, _name, _value_mapping) \
#define DEFINE_OPTION_VALUES(_section, _name, _value_mapping, _desc) \
{ \
.name = #_section "-" #_name, \
.value_hex = &_section##_options._name, \
.format = OPTION_FORMAT_hex, \
.value_mapping = _value_mapping, \
.size = sizeof(_section##_options._name), \
.description = _desc, \
}
#define DEFINE_OPTION_PTR(_section, _name, _type) \
#define DEFINE_OPTION_PTR(_section, _name, _type, _desc) \
{ \
.name = #_section "-" #_name, \
.value_##_type = _section##_options._name, \
.format = OPTION_FORMAT_##_type, \
.size = sizeof(_section##_options._name), \
.description = _desc, \
}
int parse_opts(option_t *options, int argc, char *argv[]);