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  1. 3
      .gitignore
  2. 165
      LICENSE
  3. 26
      Makefile
  4. 11
      README.md
  5. 252
      src/flagok.c
  6. 87
      src/flagok.h
  7. 40
      testing/test.c

3
.gitignore vendored
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/bin
/.vscode
test

165
LICENSE
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GNU LESSER GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
This version of the GNU Lesser General Public License incorporates
the terms and conditions of version 3 of the GNU General Public
License, supplemented by the additional permissions listed below.
0. Additional Definitions.
As used herein, "this License" refers to version 3 of the GNU Lesser
General Public License, and the "GNU GPL" refers to version 3 of the GNU
General Public License.
"The Library" refers to a covered work governed by this License,
other than an Application or a Combined Work as defined below.
An "Application" is any work that makes use of an interface provided
by the Library, but which is not otherwise based on the Library.
Defining a subclass of a class defined by the Library is deemed a mode
of using an interface provided by the Library.
A "Combined Work" is a work produced by combining or linking an
Application with the Library. The particular version of the Library
with which the Combined Work was made is also called the "Linked
Version".
The "Minimal Corresponding Source" for a Combined Work means the
Corresponding Source for the Combined Work, excluding any source code
for portions of the Combined Work that, considered in isolation, are
based on the Application, and not on the Linked Version.
The "Corresponding Application Code" for a Combined Work means the
object code and/or source code for the Application, including any data
and utility programs needed for reproducing the Combined Work from the
Application, but excluding the System Libraries of the Combined Work.
1. Exception to Section 3 of the GNU GPL.
You may convey a covered work under sections 3 and 4 of this License
without being bound by section 3 of the GNU GPL.
2. Conveying Modified Versions.
If you modify a copy of the Library, and, in your modifications, a
facility refers to a function or data to be supplied by an Application
that uses the facility (other than as an argument passed when the
facility is invoked), then you may convey a copy of the modified
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a) under this License, provided that you make a good faith effort to
ensure that, in the event an Application does not supply the
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whatever part of its purpose remains meaningful, or
b) under the GNU GPL, with none of the additional permissions of
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3. Object Code Incorporating Material from Library Header Files.
The object code form of an Application may incorporate material from
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for conveying Corresponding Source.)
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You may place library facilities that are a work based on the
Library side by side in a single library together with other library
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choice, if you do both of the following:
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is a work based on the Library, and explaining where to find the
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6. Revised Versions of the GNU Lesser General Public License.
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26
Makefile
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CC:=gcc
CFLAGS:=-O2 -Wall -Werror
LIBNAME:=flagok
LIBNAMESHARED:=$(LIBNAME).so
LIBNAMESTATIC:=$(LIBNAME).a
SRC:=src/flagok.c
BINDIR:=bin
TESTSRC:=testing/test.c
TESTBIN:=test
shared:
mkdir -p $(BINDIR) && \
$(CC) $(SRC) $(CFLAGS) -shared -fPIC -o $(BINDIR)/$(LIBNAMESHARED)
static:
mkdir -p $(BINDIR) && \
$(CC) $(SRC) $(CFLAGS) -c && \
ar rcs $(BINDIR)/$(LIBNAMESTATIC) *.o && \
rm *.o
test: static
$(CC) $(CFLAGS) -static $(TESTSRC) $(BINDIR)/$(LIBNAMESTATIC) -o $(TESTBIN) && \
./test
clean:
rm -rf $(BINDIR) $(TESTBIN) *.o

11
README.md
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# flagok (флажок) - C/C++ command line flags library
## Installation
## Usage
### Example
## License
LGPLv3

252
src/flagok.c
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/*
FLAGOK - C/C++ command line flags library
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "flagok.h"
flag_collector_t* collector = NULL;
// Create a new flag collector on heap (should not be called outside of library)
flag_collector_t* flag_new_collector() {
flag_collector_t* new_collector;
new_collector = (flag_collector_t*) malloc(sizeof(flag_collector_t));
new_collector->count = 0;
// add default help flag
new_collector->flags[new_collector->count] = (flag_t) {
name: FLAGHELP,
value_type: BOOL,
value: false,
description: "Print this help message"
};
new_collector->count++;
return new_collector;
}
// Free flag collector
void flag_free_collector() {
if (collector) {
free(collector);
}
}
// Create a new flag and put it in the collector, if it does not exist - creates a new one
void flag(void* value, ValueType type , const char* name, const char* description) {
flag_t new_bool_flag = (flag_t) {
name: name,
value_type: type,
value: value,
description: description,
};
if (!collector) {
collector = flag_new_collector();
}
if (collector) {
collector->flags[collector->count] = new_bool_flag;
collector->count++;
}
}
// Register a boolean flag
void flag_bool(bool* value, const char* name, const char* description) {
flag(value, BOOL, name, description);
}
// Register an integer (long long) flag
void flag_int(long long* value, const char* name, const char* description) {
flag(value, INT, name, description);
}
// Register an unsigned integer (unsigned long long) flag
void flag_uint(unsigned long long* value, const char* name, const char* description) {
flag(value, UINT, name, description);
}
// Register an double (long double) flag
void flag_double(long double* value, const char* name, const char* description) {
flag(value, DOUBLE, name, description);
}
// Register a string flag
void flag_str(char** value, const char* name, const char* description) {
flag(value, STRING, name, description);
}
// Parse flags and assign new values if present
void flag_parse(int argc, char** argv) {
int collector_index, arg_index;
flag_t flag;
char* arg;
arg_index = 1;
while (arg_index < argc) {
arg = argv[arg_index];
for (collector_index = 0; (unsigned int) collector_index < collector->count; collector_index++) {
flag = collector->flags[collector_index];
// compare arugument with each flag's name
if (strcmp(arg, flag.name) == 0) {
// that's a match !
switch (flag.value_type) {
case INT: {
if (arg_index+1 >= argc) {
break;
}
arg_index++;
arg = argv[arg_index];
long long value;
value = strtoll(arg, NULL, 0);
if (value == LLONG_MAX || value == LLONG_MIN) {
break;
}
*(long long*) flag.value = value;
break;
}
case UINT: {
if (arg_index+1 >= argc) {
break;
}
arg_index++;
arg = argv[arg_index];
unsigned long long value;
value = strtoull(arg, NULL, 0);
if (value == ULLONG_MAX) {
break;
}
*(unsigned long long*) flag.value = value;
break;
}
case BOOL: {
bool value = true;
if (arg_index+1 >= argc) {
break;
}
if (strcmp(argv[arg_index+1], "true") == 0 || strcmp(argv[arg_index+1], "1") == 0) {
value = true;
} else if (strcmp(argv[arg_index+1], "false") == 0 || strcmp(argv[arg_index+1], "0") == 0) {
value = false;
}
*(bool*) flag.value = value;
break;
}
case DOUBLE: {
if (arg_index+1 >= argc) {
break;
}
arg_index++;
arg = argv[arg_index];
long double value;
if (sscanf(arg, "%Lf", &value) != 0) {
*(long double*) flag.value = value;
}
break;
}
case STRING: {
if (arg_index+1 >= argc) {
break;
}
arg_index++;
arg = argv[arg_index];
char* value = arg;
*(char**) flag.value = value;
break;
}
}
// check if it's a help message
if (strcmp(flag.name, FLAGHELP) == 0) {
flag_print_help(stdout);
}
}
}
arg_index++;
}
}
// Print help message containing information about registered flags
void flag_print_help(FILE* output) {
unsigned int i;
flag_t flag;
fprintf(output, "Usage:\n");
for (i = 0; i < collector->count; i++) {
flag = collector->flags[i];
if (strcmp(flag.name, FLAGHELP) == 0) {
continue;
}
switch (flag.value_type) {
case BOOL: {
fprintf(output, "%s (bool) [default: %s]\n\t%s\n",
flag.name,
*(bool*) flag.value ? "true" : "false",
flag.description
);
break;
}
case INT: {
fprintf(output, "%s (int) [default: %lld]\n\t%s\n",
flag.name,
*(long long*) flag.value,
flag.description
);
break;
}
case UINT: {
fprintf(output, "%s (uint) [default: %lld]\n\t%s\n",
flag.name,
*(unsigned long long*) flag.value,
flag.description
);
break;
}
case DOUBLE: {
fprintf(output, "%s (double) [default: %Lf]\n\t%s\n",
flag.name,
*(long double*) flag.value,
flag.description
);
break;
}
case STRING: {
fprintf(output, "%s (string) [default: %s]\n\t%s\n",
flag.name,
*(char**) flag.value,
flag.description
);
break;
}
}
}
// exit
exit(EXIT_SUCCESS);
}

87
src/flagok.h
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/*
FLAGOK - C/C++ command line flags library
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef flagok
#define flagok
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <limits.h>
#include <stdbool.h>
#define FLAGSMAX 64
#define FLAGHELP "-help"
// Supported flag value types
typedef enum ValueType {
BOOL,
INT,
UINT,
DOUBLE,
STRING,
} ValueType;
// Unified flag structure
typedef struct flag_t {
const char* name;
ValueType value_type;
void* value;
const char* description;
} flag_t;
// Registered flags collector and holder
typedef struct flag_collector_t {
unsigned int count;
flag_t flags[FLAGSMAX];
} flag_collector_t;
extern flag_collector_t* collector;
// Create a new flag collector on heap (should not be called outside of library)
flag_collector_t* flag_new_collector();
// Free flag collector
void flag_free_collector();
// Create a new flag and put it in the collector, if it does not exist - creates a new one
void flag(void* value, ValueType type, const char* name, const char* description);
// Register a boolean flag
void flag_bool(bool* value, const char* name, const char* description);
// Register an integer (long long) flag
void flag_int(long long* value, const char* name, const char* description);
// Register an unsigned integer (unsigned long long) flag
void flag_uint(unsigned long long* value, const char* name, const char* description);
// Register an double (long double) flag
void flag_double(long double* value, const char* name, const char* description);
// Register a string flag
void flag_str(char** value, const char* name, const char* description);
// Parse flags and assign new values if present
void flag_parse(int argc, char** argv);
// Print help message containing information about registered flags
void flag_print_help(FILE* output);
#endif

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testing/test.c
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/*
FLAGOK - C/C++ command line flags library
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "../src/flagok.h"
int main(int argc, char** argv) {
long long iteration = 1;
char* input = "hello";
bool to_do_or_not = false;
flag_int(&iteration, "-iteration", "set iterations");
flag_str(&input, "-input", "set input");
flag_bool(&to_do_or_not, "-to_do_or_not", "set true or false");
printf("Flags before parsing\n");
printf("iter %lld\n", iteration);
printf("input %s\n", input);
printf("todo %d\n", to_do_or_not);
flag_parse(argc, argv);
printf("Flags after parsing\n");
printf("iter %lld\n", iteration);
printf("input %s\n", input);
printf("todo %d\n", to_do_or_not);
}
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