/****************************************************************************/
/* argv.h: a thread-safe argument vector parser and usage screen generator */
/* Copyright (C) 2015--2016 Z. Gilboa */
/* Released under the Standard MIT License; see COPYING.SOFORT. */
/* This file is (also) part of sofort: portable software project template. */
/****************************************************************************/
#ifndef ARGV_H
#define ARGV_H
#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#define ARGV_VERBOSITY_NONE 0x00
#define ARGV_VERBOSITY_ERRORS 0x01
#define ARGV_VERBOSITY_STATUS 0x02
#define ARGV_CLONE_VECTOR 0x80
#ifndef ARGV_TAB_WIDTH
#define ARGV_TAB_WIDTH 8
#endif
/*******************************************/
/* */
/* support of hybrid options */
/* ------------------------- */
/* hybrid options are very similar to */
/* long options, yet are prefixed by */
/* a single dash rather than two */
/* (i.e. -std, -isystem). */
/* hybrid options are supported by this */
/* driver for compatibility with legacy */
/* tools; note, however, that the use */
/* of hybrid options should be strongly */
/* discouraged due to the limitations */
/* they impose on short options (for */
/* example, a driver implementing -std */
/* may not provide -s as a short option */
/* that takes an arbitrary value). */
/* */
/* SPACE: -hybrid VALUE (i.e. -MF file) */
/* EQUAL: -hybrid=VALUE (i.e. -std=c99) */
/* COMMA: -hybrid,VALUE (i.e. -Wl,<arg>) */
/* ONLY: -opt accepted, --opt rejected */
/* JOINED: -optVALUE */
/* */
/*******************************************/
#define ARGV_OPTION_HYBRID_NONE 0x00
#define ARGV_OPTION_HYBRID_ONLY 0x01
#define ARGV_OPTION_HYBRID_SPACE 0x02
#define ARGV_OPTION_HYBRID_EQUAL 0x04
#define ARGV_OPTION_HYBRID_COMMA 0x08
#define ARGV_OPTION_HYBRID_JOINED 0x10
#define ARGV_OPTION_HYBRID_CIRCUS (ARGV_OPTION_HYBRID_SPACE \
| ARGV_OPTION_HYBRID_JOINED)
#define ARGV_OPTION_HYBRID_DUAL (ARGV_OPTION_HYBRID_SPACE \
| ARGV_OPTION_HYBRID_EQUAL)
#define ARGV_OPTION_HYBRID_SWITCH (ARGV_OPTION_HYBRID_ONLY \
| ARGV_OPTION_HYBRID_SPACE \
| ARGV_OPTION_HYBRID_EQUAL \
| ARGV_OPTION_HYBRID_COMMA \
| ARGV_OPTION_HYBRID_JOINED)
enum argv_optarg {
ARGV_OPTARG_NONE,
ARGV_OPTARG_REQUIRED,
ARGV_OPTARG_OPTIONAL,
};
enum argv_mode {
ARGV_MODE_SCAN,
ARGV_MODE_COPY,
};
enum argv_error {
ARGV_ERROR_OK,
ARGV_ERROR_INTERNAL,
ARGV_ERROR_SHORT_OPTION,
ARGV_ERROR_LONG_OPTION,
ARGV_ERROR_OPTARG_NONE,
ARGV_ERROR_OPTARG_REQUIRED,
ARGV_ERROR_OPTARG_PARADIGM,
ARGV_ERROR_HYBRID_NONE,
ARGV_ERROR_HYBRID_ONLY,
ARGV_ERROR_HYBRID_SPACE,
ARGV_ERROR_HYBRID_EQUAL,
ARGV_ERROR_HYBRID_COMMA,
};
struct argv_option {
const char * long_name;
const char short_name;
int tag;
enum argv_optarg optarg;
int flags;
const char * paradigm;
const char * argname;
const char * description;
};
struct argv_entry {
const char * arg;
int tag;
bool fopt;
bool fval;
bool fnoscan;
enum argv_error errcode;
};
struct argv_meta {
char ** argv;
struct argv_entry * entries;
};
struct argv_meta_impl {
char ** argv;
char * strbuf;
struct argv_meta meta;
};
struct argv_ctx {
int flags;
int mode;
int nentries;
int unitidx;
int erridx;
enum argv_error errcode;
const char * errch;
const struct argv_option * erropt;
const char * program;
};
#ifdef ARGV_DRIVER
static const char * argv_program_name(const char *);
static void argv_usage(
FILE *,
const char * header,
const struct argv_option[],
const char * mode);
static struct argv_meta * argv_get(
char **,
const struct argv_option[],
int flags);
static void argv_free(struct argv_meta *);
/*------------------------------------*/
/* implementation of static functions */
/*------------------------------------*/
static const struct argv_option * argv_short_option(
const char * ch,
const struct argv_option options[],
struct argv_entry * entry)
{
const struct argv_option * option;
for (option=options; option->long_name || option->short_name; option++) {
if (option->short_name == *ch) {
entry->tag = option->tag;
entry->fopt = true;
return option;
}
}
return 0;
}
static const struct argv_option * argv_long_option(
const char * ch,
const struct argv_option options[],
struct argv_entry * entry)
{
const struct argv_option * option;
const char * arg;
size_t len;
for (option=options; option->long_name || option->short_name; option++) {
len = option->long_name ? strlen(option->long_name) : 0;
if (len && !(strncmp(option->long_name,ch,len))) {
arg = ch + len;
if (!*arg
|| (*arg == '=')
|| (option->flags & ARGV_OPTION_HYBRID_JOINED)
|| ((option->flags & ARGV_OPTION_HYBRID_COMMA)
&& (*arg == ','))) {
entry->tag = option->tag;
entry->fopt = true;
return option;
}
}
}
return 0;
}
static inline bool is_short_option(const char * arg)
{
return (arg[0]=='-') && arg[1] && (arg[1]!='-');
}
static inline bool is_long_option(const char * arg)
{
return (arg[0]=='-') && (arg[1]=='-') && arg[2];
}
static inline bool is_last_option(const char * arg)
{
return (arg[0]=='-') && (arg[1]=='-') && !arg[2];
}
static inline bool is_hybrid_option(
const char * arg,
const struct argv_option options[])
{
const struct argv_option * option;
struct argv_entry entry;
if (!is_short_option(arg))
return false;
if (!(option = argv_long_option(++arg,options,&entry)))
return false;
if (!(option->flags & ARGV_OPTION_HYBRID_SWITCH))
if (argv_short_option(arg,options,&entry))
return false;
return true;
}
static inline bool is_arg_in_paradigm(const char * arg, const char * paradigm)
{
size_t len;
const char * ch;
for (ch=paradigm,len=strlen(arg); ch; ) {
if (!strncmp(arg,ch,len)) {
if (!*(ch += len))
return true;
else if (*ch == '|')
return true;
}
if ((ch = strchr(ch,'|')))
ch++;
}
return false;
}
static inline const struct argv_option * option_from_tag(
const struct argv_option options[],
int tag)
{
const struct argv_option * option;
for (option=options; option->short_name || option->long_name; option++)
if (option->tag == tag)
return option;
return 0;
}
static void argv_scan(
char ** argv,
const struct argv_option options[],
struct argv_ctx * ctx,
struct argv_meta * meta)
{
char ** parg;
const char * ch;
const char * val;
const struct argv_option * option;
struct argv_entry entry;
struct argv_entry * mentry;
enum argv_error ferr;
bool fval;
bool fnext;
bool fshort;
bool fhybrid;
bool fnoscan;
parg = &argv[1];
ch = *parg;
ferr = ARGV_ERROR_OK;
fshort = false;
fnoscan = false;
fval = false;
mentry = meta ? meta->entries : 0;
ctx->unitidx = 0;
ctx->erridx = 0;
while (ch && (ferr == ARGV_ERROR_OK)) {
option = 0;
fhybrid = false;
if (fnoscan)
fval = true;
else if (is_last_option(ch))
fnoscan = true;
else if (!fshort && is_hybrid_option(ch,options))
fhybrid = true;
if (!fnoscan && !fhybrid && (fshort || is_short_option(ch))) {
if (!fshort)
ch++;
if ((option = argv_short_option(ch,options,&entry))) {
if (ch[1]) {
ch++;
fnext = false;
fshort = (option->optarg == ARGV_OPTARG_NONE);
} else {
parg++;
ch = *parg;
fnext = true;
fshort = false;
}
if (option->optarg == ARGV_OPTARG_NONE) {
if (!fnext && ch && (*ch == '-'))
ferr = ARGV_ERROR_OPTARG_NONE;
else
fval = false;
} else if (!fnext)
fval = true;
else if (option->optarg == ARGV_OPTARG_REQUIRED) {
if (ch && is_short_option(ch))
ferr = ARGV_ERROR_OPTARG_REQUIRED;
else if (ch && is_long_option(ch))
ferr = ARGV_ERROR_OPTARG_REQUIRED;
else if (ch && is_last_option(ch))
ferr = ARGV_ERROR_OPTARG_REQUIRED;
else if (ch)
fval = true;
else
ferr = ARGV_ERROR_OPTARG_REQUIRED;
} else {
/* ARGV_OPTARG_OPTIONAL */
if (ch && is_short_option(ch))
fval = false;
else if (ch && is_long_option(ch))
fval = false;
else if (ch && is_last_option(ch))
fval = false;
else
fval = ch;
}
} else
ferr = ARGV_ERROR_SHORT_OPTION;
} else if (!fnoscan && (fhybrid || is_long_option(ch))) {
ch += (fhybrid ? 1 : 2);
if ((option = argv_long_option(ch,options,&entry))) {
val = ch + strlen(option->long_name);
/* val[0] is either '=' (or ',') or '\0' */
if (!val[0]) {
parg++;
ch = *parg;
}
if (fhybrid && !(option->flags & ARGV_OPTION_HYBRID_SWITCH))
ferr = ARGV_ERROR_HYBRID_NONE;
else if (!fhybrid && (option->flags & ARGV_OPTION_HYBRID_ONLY))
ferr = ARGV_ERROR_HYBRID_ONLY;
else if (option->optarg == ARGV_OPTARG_NONE) {
if (val[0]) {
ferr = ARGV_ERROR_OPTARG_NONE;
ctx->errch = val + 1;
} else
fval = false;
} else if (val[0] && (option->flags & ARGV_OPTION_HYBRID_JOINED)) {
fval = true;
ch = val;
} else if (fhybrid && !val[0] && !(option->flags & ARGV_OPTION_HYBRID_SPACE))
ferr = ARGV_ERROR_HYBRID_SPACE;
else if (fhybrid && (val[0]=='=') && !(option->flags & ARGV_OPTION_HYBRID_EQUAL))
ferr = ARGV_ERROR_HYBRID_EQUAL;
else if (fhybrid && (val[0]==',') && !(option->flags & ARGV_OPTION_HYBRID_COMMA))
ferr = ARGV_ERROR_HYBRID_COMMA;
else if (!fhybrid && (val[0]==','))
ferr = ARGV_ERROR_HYBRID_COMMA;
else if (val[0] && !val[1])
ferr = ARGV_ERROR_OPTARG_REQUIRED;
else if (val[0] && val[1]) {
fval = true;
ch = ++val;
} else if (option->optarg == ARGV_OPTARG_REQUIRED) {
if (!val[0] && !*parg)
ferr = ARGV_ERROR_OPTARG_REQUIRED;
else if (*parg && is_short_option(*parg))
ferr = ARGV_ERROR_OPTARG_REQUIRED;
else if (*parg && is_long_option(*parg))
ferr = ARGV_ERROR_OPTARG_REQUIRED;
else if (*parg && is_last_option(*parg))
ferr = ARGV_ERROR_OPTARG_REQUIRED;
else
fval = true;
} else {
/* ARGV_OPTARG_OPTIONAL */
fval = val[0];
}
} else
ferr = ARGV_ERROR_LONG_OPTION;
}
if (ferr == ARGV_ERROR_OK)
if (option && fval && option->paradigm)
if (!is_arg_in_paradigm(ch,option->paradigm))
ferr = ARGV_ERROR_OPTARG_PARADIGM;
if (ferr == ARGV_ERROR_OK)
if (!option && !ctx->unitidx)
ctx->unitidx = parg - argv;
if (ferr != ARGV_ERROR_OK) {
ctx->errcode = ferr;
ctx->errch = ctx->errch ? ctx->errch : ch;
ctx->erropt = option;
ctx->erridx = parg - argv;
return;
} else if (ctx->mode == ARGV_MODE_SCAN) {
if (!fnoscan)
ctx->nentries++;
else if (fval)
ctx->nentries++;
if (fval || !option) {
parg++;
ch = *parg;
}
} else if (ctx->mode == ARGV_MODE_COPY) {
if (fnoscan) {
if (fval) {
mentry->arg = ch;
mentry->fnoscan = true;
mentry++;
}
parg++;
ch = *parg;
} else if (option) {
mentry->arg = fval ? ch : 0;
mentry->tag = option->tag;
mentry->fopt = true;
mentry->fval = fval;
mentry++;
if (fval) {
parg++;
ch = *parg;
}
} else {
mentry->arg = ch;
mentry++;
parg++;
ch = *parg;
}
}
}
}
static const char * argv_program_name(const char * program_path)
{
const char * ch;
if (program_path) {
if ((ch = strrchr(program_path,'/')))
return *(++ch) ? ch : 0;
if ((ch = strrchr(program_path,'\\')))
return *(++ch) ? ch : 0;
}
return program_path;
}
static void argv_show_error(struct argv_ctx * ctx)
{
fprintf(stderr,"%s: error: ",ctx->program);
switch (ctx->errcode) {
case ARGV_ERROR_SHORT_OPTION:
fprintf(stderr,"'-%c' is not a valid short option\n",*ctx->errch);
break;
case ARGV_ERROR_LONG_OPTION:
fprintf(stderr,"'--%s' is not a valid long option\n",ctx->errch);
break;
case ARGV_ERROR_OPTARG_NONE:
fprintf(stderr,"'%s' is not a valid option value for [%s%c%s%s%s] "
"(option values may not be specified)\n",
ctx->errch,
ctx->erropt->short_name ? "-" : "",
ctx->erropt->short_name,
ctx->erropt->short_name ? "," : "",
ctx->erropt->long_name ? "--" : "",
ctx->erropt->long_name);
break;
case ARGV_ERROR_OPTARG_REQUIRED:
fprintf(stderr,"option [%s%c%s%s%s] requires %s %s%s%s\n",
ctx->erropt->short_name ? "-" : "",
ctx->erropt->short_name,
ctx->erropt->short_name ? "," : "",
ctx->erropt->long_name ? "--" : "",
ctx->erropt->long_name,
ctx->erropt->paradigm ? "one of the following values:" : "a value",
ctx->erropt->paradigm ? "{" : "",
ctx->erropt->paradigm ? ctx->erropt->paradigm : "",
ctx->erropt->paradigm ? "}" : "");
break;
case ARGV_ERROR_OPTARG_PARADIGM:
fprintf(stderr,"'%s' is not a valid option value for [%s%c%s%s%s]={%s}\n",
ctx->errch,
ctx->erropt->short_name ? "-" : "",
ctx->erropt->short_name,
ctx->erropt->short_name ? "," : "",
ctx->erropt->long_name ? "--" : "",
ctx->erropt->long_name,
ctx->erropt->paradigm);
break;
case ARGV_ERROR_HYBRID_NONE:
fprintf(stderr,"-%s is not a synonym for --%s\n",
ctx->erropt->long_name,
ctx->erropt->long_name);
break;
case ARGV_ERROR_HYBRID_ONLY:
fprintf(stderr,"--%s is not a synonym for -%s\n",
ctx->erropt->long_name,
ctx->erropt->long_name);
break;
case ARGV_ERROR_HYBRID_SPACE:
case ARGV_ERROR_HYBRID_EQUAL:
case ARGV_ERROR_HYBRID_COMMA:
fprintf(stderr,"-%s: illegal value assignment; valid syntax is "
"-%s%sVAL\n",
ctx->erropt->long_name,
ctx->erropt->long_name,
(ctx->erropt->flags & ARGV_OPTION_HYBRID_SPACE)
? " " : (ctx->erropt->flags & ARGV_OPTION_HYBRID_EQUAL)
? "=" : (ctx->erropt->flags & ARGV_OPTION_HYBRID_COMMA)
? "," : "");
break;
case ARGV_ERROR_INTERNAL:
fputs("internal error",stderr);
break;
default:
break;
}
}
static void argv_show_status(
const struct argv_option options[],
struct argv_ctx * ctx,
struct argv_meta * meta)
{
int argc;
char ** argv;
struct argv_entry * entry;
const struct argv_option * option;
char short_name[2] = {0};
const char * space = "";
(void)ctx;
fputs("\n\nconcatenated command line:\n",stderr);
for (argv=meta->argv; *argv; argv++) {
fprintf(stderr,"%s%s",space,*argv);
space = " ";
}
fputs("\n\nargument vector:\n",stderr);
for (argc=0,argv=meta->argv; *argv; argc++,argv++)
fprintf(stderr,"argv[%d]: %s\n",argc,*argv);
fputs("\n\nparsed entries:\n",stderr);
for (entry=meta->entries; entry->arg || entry->fopt; entry++)
if (entry->fopt) {
option = option_from_tag(options,entry->tag);
short_name[0] = option->short_name;
if (entry->fval)
fprintf(stderr,"[-%s,--%s] := %s\n",
short_name,option->long_name,entry->arg);
else
fprintf(stderr,"[-%s,--%s]\n",
short_name,option->long_name);
} else
fprintf(stderr,"<program arg> := %s\n",entry->arg);
fputs("\n\n",stderr);
}
static struct argv_meta * argv_free_impl(struct argv_meta_impl * imeta)
{
if (imeta->argv)
free(imeta->argv);
if (imeta->strbuf)
free(imeta->strbuf);
if (imeta->meta.entries)
free(imeta->meta.entries);
free(imeta);
return 0;
}
static struct argv_meta * argv_alloc(char ** argv, struct argv_ctx * ctx)
{
struct argv_meta_impl * imeta;
char ** vector;
char * dst;
size_t size;
int argc;
int i;
if (!(imeta = calloc(1,sizeof(*imeta))))
return 0;
if (ctx->flags & ARGV_CLONE_VECTOR) {
for (vector=argv,argc=0,size=0; *vector; vector++) {
size += strlen(*vector) + 1;
argc++;
}
if (!(imeta->argv = calloc(argc+1,sizeof(char *))))
return argv_free_impl(imeta);
else if (!(imeta->strbuf = calloc(1,size+1)))
return argv_free_impl(imeta);
for (i=0,dst=imeta->strbuf; i<argc; i++) {
strcpy(dst,argv[i]);
imeta->argv[i] = dst;
dst += strlen(dst)+1;
}
imeta->meta.argv = imeta->argv;
} else
imeta->meta.argv = argv;
if (!(imeta->meta.entries = calloc(
ctx->nentries+1,
sizeof(struct argv_entry))))
return argv_free_impl(imeta);
else
return &imeta->meta;
}
static struct argv_meta * argv_get(
char * argv[],
const struct argv_option options[],
int flags)
{
struct argv_meta * meta;
struct argv_ctx ctx = {flags,ARGV_MODE_SCAN,0,0,0,0,0,0,0};
argv_scan(argv,options,&ctx,0);
if (ctx.errcode != ARGV_ERROR_OK) {
if (!ctx.program)
ctx.program = argv_program_name(argv[0]);
if (ctx.flags & ARGV_VERBOSITY_ERRORS)
argv_show_error(&ctx);
return 0;
}
if (!(meta = argv_alloc(argv,&ctx)))
return 0;
ctx.mode = ARGV_MODE_COPY;
argv_scan(meta->argv,options,&ctx,meta);
if (ctx.errcode != ARGV_ERROR_OK) {
if (!ctx.program)
ctx.program = argv[0];
ctx.errcode = ARGV_ERROR_INTERNAL;
argv_show_error(&ctx);
argv_free(meta);
return 0;
}
if (ctx.flags & ARGV_VERBOSITY_STATUS)
argv_show_status(options,&ctx,meta);
return meta;
}
static void argv_free(struct argv_meta * xmeta)
{
struct argv_meta_impl * imeta;
uintptr_t addr;
if (xmeta) {
addr = (uintptr_t)xmeta - offsetof(struct argv_meta_impl,meta);
imeta = (struct argv_meta_impl *)addr;
argv_free_impl(imeta);
}
}
static void argv_usage(
FILE * file,
const char * header,
const struct argv_option options[],
const char * mode)
{
const struct argv_option * option;
bool fshort,flong,fboth;
size_t len,optlen,desclen;
char cache;
char * prefix;
char * desc;
char * mark;
char * cap;
char description[4096];
char optstr [72];
const size_t optcap = 64;
const size_t width = 80;
const char indent[] = " ";
const char creset[] = "\x1b[0m";
const char cbold [] = "\x1b[1m";
const char cgreen[] = "\x1b[32m";
const char cblue [] = "\x1b[34m";
const char ccyan [] = "\x1b[36m";
const char * color = ccyan;
bool fcolor;
fshort = mode ? !strcmp(mode,"short") : 0;
flong = fshort ? 0 : mode && !strcmp(mode,"long");
fboth = !fshort && !flong;
fcolor = isatty(fileno(file));
if (fcolor)
fprintf(file,"%s%s",cbold,cgreen);
if (header)
fprintf(file,"%s",header);
option = options;
optlen = 0;
for (; option->short_name || option->long_name; option++) {
/* indent + comma */
len = fboth ? sizeof(indent) + 1 : sizeof(indent);
/* -o */
if (fshort || fboth)
len += option->short_name
? 2 : 0;
/* --option */
if (flong || fboth)
len += option->long_name
? 2 + strlen(option->long_name) : 0;
/* optlen */
if (len > optlen)
optlen = len;
}
if (optlen >= optcap) {
fprintf(stderr,
"Option strings exceed %zu characters, "
"please generate the usage screen manually.\n",
optcap);
return;
}
optlen += ARGV_TAB_WIDTH;
optlen &= (~(ARGV_TAB_WIDTH-1));
desclen = (optlen < width / 2) ? width - optlen : optlen;
for (option=options; option->short_name || option->long_name; option++) {
/* color */
if (fcolor) {
color = (color == ccyan) ? cblue : ccyan;
fputs(color,file);
}
/* description, using either paradigm or argname if applicable */
snprintf(description,sizeof(description),option->description,
option->paradigm
? option->paradigm
: option->argname ? option->argname : "");
description[sizeof(description)-1] = 0;
/* long/hybrid option prefix (-/--) */
prefix = option->flags & ARGV_OPTION_HYBRID_ONLY
? " -" : "--";
/* option string */
if (fboth && option->short_name && option->long_name)
sprintf(optstr,"%s-%c,%s%s",
indent,option->short_name,prefix,option->long_name);
else if ((fshort || fboth) && option->short_name)
sprintf(optstr,"%s-%d",indent,option->short_name);
else if (flong && option->long_name)
sprintf(optstr,"%s%s%s",
indent,prefix,option->long_name);
else if (fboth && option->long_name)
sprintf(optstr,"%s %s%s",
indent,prefix,option->long_name);
else
optstr[0] = 0;
/* right-indented option buffer */
if (description[0]) {
len = strlen(optstr);
sprintf(&optstr[len],"%-*c",(int)(optlen-len),' ');
}
/* single line? */
if (optlen + strlen(description) < width) {
fprintf(file,"%s%s\n",optstr,description);
} else {
desc = description;
cap = desc + strlen(description);
while (desc < cap) {
mark = (desc + desclen >= cap)
? cap : desc + desclen;
while (*mark && (mark > desc)
&& (*mark != ' ')
&& (*mark != '|')
&& (*mark != '\t')
&& (*mark != '\n'))
mark--;
if (mark == desc) {
mark = (desc + desclen >= cap)
? cap : desc + desclen;
cache = *mark;
*mark = 0;
} else if (*mark == '|') {
cache = *mark;
*mark = 0;
} else {
cache = 0;
*mark = 0;
}
/* first line? */
if (desc == description)
fprintf(file,"%s%s\n",optstr,desc);
else
fprintf(file,"%-*c %s\n",
(*desc == '|')
? (int)(optlen+1)
: (int)optlen,
' ',desc);
if (cache)
*mark = cache;
else
mark++;
desc = mark;
}
}
}
if (fcolor)
fputs(creset,file);
}
#endif
#endif