source: libcfa/src/parseargs.cfa @ 8fceae2

//
// Cforall Version 1.0.0 Copyright (C) 2022 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// parseargs.cfa
// implementation of arguments parsing (argc, argv)
//
// Author           : Thierry Delisle
// Created On       : Wed Oct 12 15:28:01 2022
// Last Modified By :
// Last Modified On :
// Update Count     :
//

#include "parseargs.hfa"

#include <assert.h>
#include <ctype.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>

extern "C" {
        #include <getopt.h>
        #include <sys/ioctl.h>

        struct FILE;
        extern FILE * stderr;
        extern FILE * stdout;

        extern int fileno(FILE *stream);

        extern int fprintf ( FILE * stream, const char * format, ... );

        extern          long long int strtoll (const char* str, char** endptr, int base);
        extern unsigned long long int strtoull(const char* str, char** endptr, int base);
        extern                 double strtod  (const char* str, char** endptr);
}

#include "common.hfa"
#include "limits.hfa"

#pragma GCC visibility push(default)

extern int cfa_args_argc __attribute__((weak));
extern char ** cfa_args_argv __attribute__((weak));
extern char ** cfa_args_envp __attribute__((weak));

forall([N])
static void usage(char * cmd, const array( cfa_option, N ) & options, const char * usage, FILE * out)  __attribute__ ((noreturn));
//-----------------------------------------------------------------------------
// checking
forall([N])
static void check_args( const array( cfa_option, N ) & options ) {
        for(i; N) {
                for(j; N) {
                        if(i == j) continue;

                        if( options[i].short_name != '\0'
                        && options[i].short_name == options[j].short_name)
                                abort("Parse Args error: two options have short name '%c' (%zu & %zu)", options[i].short_name, i, j);

                        if(0 == strcmp(options[i].long_name, options[j].long_name)) abort("Parse Args error: two options have long name '%s' (%zu & %zu)", options[i].long_name, i, j);
                }
        }
}


//-----------------------------------------------------------------------------
// Parsing args
forall([opt_count]) {
        void parse_args( const array( cfa_option, opt_count ) & options, const char * usage, char ** & left ) {
                if( 0p != &cfa_args_argc ) {
                        parse_args(cfa_args_argc, cfa_args_argv, options, usage, left );
                }
                else {
                        char * temp = "";
                        parse_args(0, &temp, options, usage, left );
                }
        }

        void parse_args(
                int argc,
                char * argv[],
                const array( cfa_option, opt_count ) & options,
                const char * usage,
                char ** & left
        ) {
                check_args(options);

                int maxv = 'h';
                char optstring[(opt_count * 3) + 2] = { '\0' };
                {
                        int idx = 0;
                        for(i; opt_count) {
                                if (options[i].short_name) {
                                        maxv = max(options[i].short_name, maxv);
                                        optstring[idx] = options[i].short_name;
                                        idx++;
                                        if(    ((intptr_t)options[i].parse) != ((intptr_t)parse_settrue)
                                        && ((intptr_t)options[i].parse) != ((intptr_t)parse_setfalse) ) {
                                                optstring[idx] = ':';
                                                idx++;
                                        }
                                }
                        }
                        optstring[idx+0] = 'h';
                        optstring[idx+1] = '\0';
                }

                struct option optarr[opt_count + 2];
                {
                        int idx = 0;
                        for(i; opt_count) {
                                if(options[i].long_name) {
                                        // we don't have the mutable keyword here, which is really what we would want
                                        int & val_ref = (int &)(const int &)options[i].val;
                                        val_ref = (options[i].short_name != '\0') ? ((int)options[i].short_name) : ++maxv;

                                        optarr[idx].name = options[i].long_name;
                                        optarr[idx].flag = 0p;
                                        optarr[idx].val  = options[i].val;
                                        if(    ((intptr_t)options[i].parse) == ((intptr_t)parse_settrue)
                                        || ((intptr_t)options[i].parse) == ((intptr_t)parse_setfalse) ) {
                                                optarr[idx].has_arg = no_argument;
                                        } else {
                                                optarr[idx].has_arg = required_argument;
                                        }
                                        idx++;
                                }
                        }
                        optarr[idx+0].[name, has_arg, flag, val] = ["help", no_argument, 0, 'h'];
                        optarr[idx+1].[name, has_arg, flag, val] = [0, no_argument, 0, 0];
                }

                FILE * out = stderr;
                NEXT_ARG:
                for() {
                        int idx = 0;
                        int opt = getopt_long(argc, argv, optstring, optarr, &idx);
                        switch(opt) {
                                case -1:
                                        if(&left != 0p) left = argv + optind;
                                        return;
                                case 'h':
                                        out = stdout;
                                case '?':
                                        usage(argv[0], options, usage, out);
                                default:
                                        for(i; opt_count) {
                                                if(opt == options[i].val) {
                                                        const char * arg = optarg ? optarg : "";
                                                        if( arg[0] == '=' ) { arg++; }
                                                        // work around for some weird bug
                                                        void * variable = options[i].variable;
                                                        bool (*parse_func)(const char *, void * ) = options[i].parse;
                                                        bool success = parse_func( arg, variable );
                                                        if(success) continue NEXT_ARG;

                                                        fprintf(out, "Argument '%s' for option %c could not be parsed\n\n", arg, (char)opt);
                                                        usage(argv[0], options, usage, out);
                                                }
                                        }
                                        abort("Internal parse arg error\n");
                        }

                }
        }
}

static inline int next_newline(const char * str) {
        int ret;
        const char * ptr = strstr(str, "\n");
        if(!ptr) return MAX;

        /* paranoid */ verify( str <= ptr);
        intptr_t low = (intptr_t)str;
        intptr_t hi  = (intptr_t)ptr;
        ret = hi - low;

        return ret;
}

//-----------------------------------------------------------------------------
// Print usage
static void printopt(FILE * out, int width, int max, char sn, const char * ln, const char * help) {
        // check how wide we should be printing
        // this includes all options and the help message
        int hwidth = max - (11 + width);
        if(hwidth <= 0) hwidth = max;

        // check which pieces we have
        bool has_ln = ln && strcmp("", ln);
        bool has_help = help && strcmp("", help);

        // print the small name if present
        if(sn != '\0') fprintf(out, "  -%c", sn);
        else fprintf(out, "    ");

        // print a comma if we have both short and long names
        if(sn != '\0' && has_ln) fprintf(out, ", ");
        else fprintf(out, "  ");

        // print the long name if present
        if(has_ln)        fprintf(out, "--%-*s", width, ln);
        else if(has_help) fprintf(out, "  %-*s", width, "");

        if(has_help) {
                // print the help
                // We need to wrap at the max width, and also indent newlines so everything is nice and pretty

                // for each line to print
                for() {
                        //find out if there is a newline
                        int nextnl = next_newline(help);
                        int real = min(min(strlen(help), hwidth), nextnl);

                        fprintf(out, "   %.*s", real, help);
                        // printf("%d %d\n", real, nextnl);
                        help += real;
                        if( nextnl == real ) help++;
                        if('\0' == *help) break;
                        fprintf(out, "\n%*s", width + 8, "");
                }
        }
        fprintf(out, "\n");
}

void print_args_usage(cfa_option options[], const size_t opt_count, const char * usage, bool error)  __attribute__ ((noreturn)) {
        const array( cfa_option, opt_count ) & arr = (const array( cfa_option, opt_count ) &) *options;
        usage(cfa_args_argv[0], arr, usage, error ? stderr : stdout);
}

void print_args_usage(int , char * argv[], cfa_option options[], const size_t opt_count, const char * usage, bool error)  __attribute__ ((noreturn)) {
        const array( cfa_option, opt_count ) & arr = (const array( cfa_option, opt_count ) &) *options;
        usage(argv[0], arr, usage, error ? stderr : stdout);
}

forall( [N] ) {
        void print_args_usage( const array(cfa_option, N ) & options, const char * usage, bool error) {
                usage(cfa_args_argv[0], options, usage, error ? stderr : stdout);
        }

        void print_args_usage(int argc, char * argv[], const array( cfa_option, N ) & options, const char * usage, bool error) {
                usage(argv[0], options, usage, error ? stderr : stdout);
        }
}

forall([N])
static void usage(char * cmd, const array( cfa_option, N ) & options, const char * help, FILE * out) __attribute__((noreturn)) {
        int width = 0;
        {
                for(i; N) {
                        if(options[i].long_name) {
                                int w = strlen(options[i].long_name);
                                if(w > width) width = w;
                        }
                }
        }

        int max_width = 1_000_000;
        int outfd = fileno(out);
        if(isatty(outfd)) {
                struct winsize size;
                int ret = ioctl(outfd, TIOCGWINSZ, &size);
                if(ret < 0) abort( "ioctl error: (%d) %s\n", (int)errno, strerror(errno) );
                max_width = size.ws_col;
        }

        fprintf(out, "Usage:\n  %s %s\n", cmd, help);

        for(i; N) {
                printopt(out, width, max_width, options[i].short_name, options[i].long_name, options[i].help);
        }
        fprintf(out, "  -%c, --%-*s   %s\n", 'h', width, "help", "print this help message");
        exit(out == stdout ? 0 : 1);
}

//-----------------------------------------------------------------------------
// Typed argument parsing
bool parse_yesno(const char * arg, bool & value ) {
        if(strcmp(arg, "yes") == 0) {
                value = true;
                return true;
        }

        if(strcmp(arg, "Y") == 0) {
                value = true;
                return true;
        }

        if(strcmp(arg, "y") == 0) {
                value = true;
                return true;
        }

        if(strcmp(arg, "no") == 0) {
                value = false;
                return true;
        }

        if(strcmp(arg, "N") == 0) {
                value = false;
                return true;
        }

        if(strcmp(arg, "n") == 0) {
                value = false;
                return true;
        }

        return false;
}

bool parse_truefalse(const char * arg, bool & value) {
        if(strcmp(arg, "true") == 0) {
                value = true;
                return true;
        }

        if(strcmp(arg, "false") == 0) {
                value = false;
                return true;
        }

        return false;
}

bool parse_settrue (const char *, bool & value ) {
        value = true;
        return true;
}

bool parse_setfalse(const char *, bool & value )  {
        value = false;
        return true;
}

bool parse(const char * arg, const char * & value ) {
        value = arg;
        return true;
}

bool parse(const char * arg, int & value) {
        char * end;

        errno = 0;
        long long int r = strtoll(arg, &end, 0);
        if(errno) return false;
        if(*end != '\0') return false;
        if(r > (int)MAX) return false;
        if(r < (int)MIN) return false;

        value = r;
        return true;
}

static unsigned long long int strict_strtoull( const char * arg, int base) {
        errno = 0;
        {
                const char * in = arg;
                for() {
                        if('\0' == *in) {
                                errno = EINVAL;
                                return 0;
                        }
                        if(!isspace(*in)) break;
                        in++;
                }
                if(!isdigit(*in)) {
                        errno = EINVAL;
                        return 0;
                }
        }

        *char end;
        unsigned long long int r = strtoull(arg, &end, base);
        if(*end != '\0') errno = EINVAL;
        if(errno) return 0;
        return r;
}

bool parse(const char * arg, unsigned & value) {
        unsigned long long int r = strict_strtoull(arg, 0);
        if(errno) return false;
        if(r > (unsigned)MAX) return false;

        value = r;
        return true;
}

bool parse(const char * arg, unsigned long & value) {
        unsigned long long int r = strict_strtoull(arg, 0);
        if(errno) return false;
        if(r > (unsigned long)MAX) return false;

        value = r;
        return true;
}

bool parse(const char * arg, unsigned long long & value) {
        unsigned long long int r = strict_strtoull(arg, 0);
        if(errno) return false;
        if(r > (unsigned long long)MAX) return false;

        value = r;
        return true;
}

bool parse(const char * arg, double & value) {
        char * end;
        double r = strtod(arg, &end);
        if(*end != '\0') return false;

        value = r;
        return true;
}