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opts_parse.c
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opts_parse.c
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/*****************************************************************************
* opts_parse -- command line option parsing and help output
*
* NOTE: Edit this file with tabstop=4 !
*
* 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 2, 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.
*
* See file COPYING for information on distribution conditions.
*
*****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "opts_parse.h"
/*
* opts_cols defines the column sizes for output
* column 1 == initial indentation
* column 2 == option/argument area
* column 3 == separator
* column 4 == description
*/
int opts_cols[] = { 2, 28, 2, 47 };
static char __opts_error[128];
/*****************************************************************************
* Local work-horse routines
*/
static int
__opt_short (char* pOptStr,
char* pArg)
{
if (! pOptStr || ! pArg)
return 0;
while (*pOptStr)
{
if (*pOptStr == *pArg)
return 1;
pOptStr++;
}
return 0;
}
static int
__opt_long (char* pOptStr,
char* pArg)
{
static char OptStr[64];
int ArgLen;
int CmpLen;
if (! pOptStr || ! pArg)
return 0;
strcpy(OptStr, pOptStr);
pOptStr = OptStr;
ArgLen = strlen(pArg);
while (pOptStr)
{
char* pNxt = (char*)strchr(pOptStr, ':');
if (pNxt)
{
*pNxt = '\0';
pNxt++;
}
CmpLen = strlen(pOptStr);
if (ArgLen < CmpLen)
CmpLen = ArgLen;
if (! strncmp(pOptStr, pArg, CmpLen))
return 1;
pOptStr = pNxt;
}
return 0;
}
/*
* See if 'pOpt' or any of it's sub-options know about 'arg'
*/
static parsed_opts*
__opt_parse (parsed_opts* pOpt,
int bShortArg,
int nArg,
char* argv[],
char* arg)
{
/*
* Is this a short or long argument?
*/
int bHandled = 0;
if (! pOpt || ! pOpt->status || ! arg || ! *arg)
return NULL;
if (bShortArg)
{
if (__opt_short(pOpt->shortopts, arg))
bHandled = 1;
}
else
{
if (__opt_long(pOpt->longopts, arg))
bHandled = 1;
}
if (! bHandled)
{
/*
* Check sub-options if this option has been seen...
*/
if ((pOpt) && (pOpt->status->optidex))
{
parsed_opts* pSubOpts = pOpt->subopts;
int idex;
pOpt = NULL;
for (idex = 0; pSubOpts && ! NULL_OPT(pSubOpts[idex]); idex++)
{
if ((pOpt = __opt_parse(&(pSubOpts[idex]), bShortArg,
nArg, argv, arg)) != NULL)
break;
}
}
else
pOpt = NULL;
}
else if (pOpt)
{
if (pOpt->status->optidex)
{
/* We've already seen this option */
pOpt->status->optidex = -1;
}
else
{
/* We have consumed this argument */
pOpt->status->optidex = nArg;
pOpt->status->opt = argv;
pOpt->status->optmod = NULL;
pOpt->status->optarg = NULL;
pOpt->status->optarg_cnt = 0;
/* Save any option modifier */
if (bShortArg)
{
if ((*(arg+1) == ':') && (*(arg+2)))
pOpt->status->optmod = arg+2;
}
else
{
char* pCol = strchr(arg, ':');
if (pCol && (*(pCol+1)))
pOpt->status->optmod = pCol+1;
}
}
}
return (pOpt);
}
/*
* Verify that supplied arguments have the proper
* number of arguments
*/
static char*
__opts_check_args (parsed_opts opts[])
{
int idex;
char* pReturn = NULL;
for (idex = 0; ! NULL_OPT(opts[idex]); idex++)
{
if (! opts[idex].status || ! opts[idex].status->optidex)
/* We didn't see this argument */
continue;
if ((opts[idex].args.mincnt > 0) &&
(opts[idex].status->optarg_cnt < (opts[idex].args.mincnt *
opts[idex].args.argblk)))
{
/* Not enough arguments for this option! */
sprintf(__opts_error,
"Not enough arguments for option [%s]: %ld < %ld",
opt_str(&(opts[idex])),
opts[idex].status->optarg_cnt,
(opts[idex].args.mincnt * opts[idex].args.argblk));
pReturn = __opts_error;
}
if ((opts[idex].args.argblk > 1) &&
(opts[idex].status->optarg_cnt % opts[idex].args.argblk))
{
/* We do NOT have full argument blocks */
sprintf(__opts_error,
"Arguments for option [%s] must be in blocks of %ld: %ld left-overs.",
opt_str(&(opts[idex])),
opts[idex].args.argblk,
opts[idex].status->optarg_cnt % opts[idex].args.argblk);
pReturn = __opts_error;
}
if (opts[idex].subopts)
pReturn = __opts_check_args(opts[idex].subopts);
}
return pReturn;
}
/*
* Check all arguments 'argv' against our options list 'opts'
*/
static char*
__opts_parse (parsed_opts opts[],
int level,
int argc,
char** argv)
{
int idex;
int jdex;
int odex;
int bConsumed = 0;
int bRestDef = 0;
parsed_opts* pCurOpt = NULL;
parsed_opts* pOpted = NULL;
parsed_opts* pArgOpt = NULL;
parsed_opts* pDefOpt = NULL;
if (! opts || (argc < 2) || ! argv)
return 0;
if (opts[0].flags & OPT_DEFAULT_ARGS)
pDefOpt = &(opts[0]);
for (idex = 1; idex < argc; idex++)
{
char* arg = argv[idex];
int bShortArg = 1;
int argStep = 1;
if ((*arg != '-') || (bRestDef))
{
/* This argument is NOT a flag */
if ((! bRestDef) && (pArgOpt))
{
/* Consumable non-flag argument */
if (! pArgOpt->status->optarg)
{
/* First argument for this option */
pArgOpt->status->optarg = &(argv[idex]);
pArgOpt->status->optarg_cnt++;
continue;
}
if (pArgOpt->status->optarg_cnt >= (pArgOpt->args.maxcnt *
pArgOpt->args.argblk))
{
/* Too many arguments */
pArgOpt = NULL;
}
else
{
pArgOpt->status->optarg_cnt++;
continue;
}
}
/* Non-consumable non-flag argument */
if (! pDefOpt || ! pDefOpt->status)
{
/* ERROR -- no default argument option */
sprintf(__opts_error,
"Unexpected non-option argument: %s",
argv[idex]);
return __opts_error;
}
if (! pDefOpt->status->optidex)
{
pDefOpt->status->optidex = idex;
pDefOpt->status->opt = &(argv[idex]);
pDefOpt->status->optarg = &(argv[idex]);
}
if (idex > pDefOpt->status->optidex + pDefOpt->status->optarg_cnt)
{
/* We cannot deal with non-contiguous default arguments... */
sprintf(__opts_error,
"Non-contiguous non-option argument: %s",
argv[idex]);
return __opts_error;
}
pDefOpt->status->optarg_cnt++;
continue;
}
#if 0
if (pDefOpt && pDefOpt->status && pDefOpt->status->optidex)
{
sprintf(__opts_error,
"Unexpected option argument: %s",
argv[idex]);
return __opts_error;
}
#endif
/*******************************************************
* See if this is one of the options that we
* handle by default...
*/
if (pDefOpt && pDefOpt->status && ! strcmp(arg, "--"))
{
/* The default argument should consume the remainder of arguments */
bRestDef = 1;
continue;
}
if (! strcmp(arg, "--help") || ! strcmp(arg, "-?"))
{
__opts_error[0] = '\0';
return __opts_error;
}
/*******************************************************/
/* Reset our argument consuming option */
pArgOpt = NULL;
bShortArg = 1;
arg++;
if (*arg == '-')
{
/* long argument */
arg++;
bShortArg = 0;
argStep = strlen(arg);
}
for (jdex = 0;jdex < strlen(arg);jdex += argStep)
{
if (*(arg+jdex) == ':')
break;
if (pCurOpt)
{
/*
* We have a "current option mode"
*/
if ((pOpted = __opt_parse(pCurOpt, bShortArg, idex,
&(argv[idex]), arg+jdex)) != NULL)
{
if (pOpted->status->optidex < 0)
{
sprintf(__opts_error,
"Duplicate option: %s", arg);
return __opts_error;
}
if (HAS_ARGS(pOpted))
pArgOpt = pOpted;
continue;
}
}
/*
* We have yet to consume this argument -- check all options
* 1) check all non-modal options
*/
bConsumed = 0;
for (odex = 0; ! NULL_OPT(opts[odex]); odex++)
{
if (opts[odex].flags & OPT_MODAL)
/* Ignore Modal options for this pass... */
continue;
if ((pOpted = __opt_parse(&(opts[odex]), bShortArg, idex,
&(argv[idex]), arg+jdex)) != NULL)
{
if (pOpted->status->optidex < 0)
{
sprintf(__opts_error,
"Duplicate option: %s", arg);
return __opts_error;
}
/* We have consumed this argument */
pCurOpt = &(opts[odex]);
if (HAS_ARGS(pOpted))
pArgOpt = pOpted;
bConsumed = 1;
break;
}
}
if (bConsumed)
continue;
/*
* We still have not consumed this argument...
* 2) if the current option is NOT modal, check all modal options
*/
if (pCurOpt && (pCurOpt->flags & OPT_MODAL))
{
/* The current option is modal -- we cannot continue! */
sprintf(__opts_error,
"Invalid option [%s] with modal option [%s]",
argv[idex],
opt_str(pCurOpt));
return __opts_error;
}
for (odex = 0; ! NULL_OPT(opts[odex]); odex++)
{
if (! (opts[odex].flags & OPT_MODAL))
/*
* Non-Modal options are ignored -- they've already been
* checked
*/
continue;
if ((pOpted = __opt_parse(&(opts[odex]), bShortArg, idex,
&(argv[idex]), arg+jdex)) != NULL)
{
if (pOpted->status->optidex < 0)
{
sprintf(__opts_error,
"Duplicate option: %s",
arg);
return __opts_error;
}
/* We have consumed this argument */
pCurOpt = &(opts[odex]);
if (HAS_ARGS(pOpted))
pArgOpt = pOpted;
bConsumed = 1;
break;
}
}
if (bConsumed)
continue;
/*
* This is a flag that we cannot consume.
* ERROR
*/
sprintf(__opts_error,"Invalid/Unknown option: %s",
argv[idex]);
return __opts_error;
}
}
/*
* Final validation -- ensure that all options which may have
* arguments have the minimum number required.
*/
if (__opts_check_args(opts))
return __opts_error;
return NULL;
}
/*
* Generate a string to represent the arguments of the given option.
*/
static
char* __opt_arg_str (parsed_opts* pOpt)
{
static char arg_str[128];
static char numarg_str[16];
if (! pOpt || ! HAS_ARGS(pOpt))
return NULL;
arg_str[0] = '\0';
numarg_str[0] = '\0';
if (pOpt->args.maxcnt > 0)
{
if (pOpt->args.mincnt > 0)
{
int nWS = 0;
char* pWS = strchr(pOpt->args.argname, ' ');
while (pWS)
{
nWS++;
pWS = strchr(pWS+1, ' ');
}
nWS++; // Count EOL as white-space
if (pOpt->args.maxcnt == ARGS_INFINITE)
{
if (nWS < (pOpt->args.mincnt * pOpt->args.argblk))
{
if (pOpt->args.argblk > 1)
sprintf(numarg_str, "{%ld:%ld,*}", pOpt->args.argblk,
pOpt->args.mincnt);
else
sprintf(numarg_str, "{%ld,*}", pOpt->args.mincnt);
}
else
strcpy(numarg_str, "...");
}
else
{
if (nWS < (pOpt->args.maxcnt * pOpt->args.argblk))
{
if (pOpt->args.argblk > 1)
sprintf(numarg_str, "{%ld:%ld,%ld}", pOpt->args.argblk,
pOpt->args.mincnt,
pOpt->args.maxcnt);
else
sprintf(numarg_str, "{%ld,%ld}", pOpt->args.mincnt,
pOpt->args.maxcnt);
}
}
}
else
strcpy(numarg_str, "...");
}
if (HAS_OPTIONAL_ARGS(pOpt))
strcat(arg_str, "[");
if (pOpt->args.argname)
strcat(arg_str, pOpt->args.argname);
else
strcat(arg_str, "arg");
strcat(arg_str, numarg_str);
if (HAS_OPTIONAL_ARGS(pOpt))
strcat(arg_str, "]");
return arg_str;
}
/*
* Output the single given option
*/
static
void __opt_print (int hFile,
parsed_opts* pOpt,
int cols[])
{
char* sopt = NULL;
char* lopt = NULL;
char* nxt_lopt = NULL;
char* opt = NULL;
char* nxt_opt = NULL;
int optIdent = 0;
char* desc = NULL;
char* nxt_desc = NULL;
int indent = 0;
int indent_nxt = -1;
int indent_hang = -1;
int bHaveShort = 0;
int bHaveLong = 0;
char out_opt[64];
if (! pOpt)
return;
sopt = pOpt->shortopts;
if (pOpt->longopts)
{
lopt = (char*)malloc(strlen(pOpt->longopts)+1);
if (! lopt)
return;
strcpy(lopt, pOpt->longopts);
nxt_lopt = lopt;
}
if (pOpt->description)
{
desc = (char*)malloc(strlen(pOpt->description)+1);
if (! desc)
{
if (lopt) free(lopt);
return;
}
strcpy(desc, pOpt->description);
nxt_desc = desc;
}
/*********************************************************************
*
* Output format:
* ' -o, --option <arg> Option Description'
* [3........................28][31..... ... ....80]
*/
while ((sopt && *sopt) || (lopt && *lopt) ||
(opt && *opt) || (desc && *desc))
{
if (! nxt_opt || ! *nxt_opt)
{
bHaveShort = 0;
bHaveLong = 0;
out_opt[0] = '\0';
/* append the current shortoption */
if (sopt && *sopt)
{
char out[3] = { '-', 0, 0 };
out[1] = *sopt;
strcat(out_opt, out);
sopt++;
bHaveShort = 1;
if (nxt_lopt && *nxt_lopt)
strcat(out_opt, ", ");
}
else
{
strcat(out_opt, " ");
}
/* append the current longoption */
if (lopt && *lopt)
{
lopt = nxt_lopt;
if (lopt)
{
if ((nxt_lopt = (char*)strchr(nxt_lopt, ':')) != NULL)
{
*nxt_lopt = '\0';
nxt_lopt++;
}
bHaveLong = 1;
strcat(out_opt, "--");
strcat(out_opt, lopt);
}
}
/* append the argument name (if provided) */
if (bHaveShort || bHaveLong)
{
char* arg_str = __opt_arg_str(pOpt);
if (arg_str)
{
strcat(out_opt, " ");
strcat(out_opt, arg_str);
}
nxt_opt = out_opt;
}
else
{
opt = NULL;
nxt_opt = NULL;
}
optIdent = 0;
}
else if (optIdent)
{
char hold[128];
int thisIdent = optIdent;
int leftOver = cols[1] - (thisIdent + strlen(nxt_opt));
strcpy(hold, nxt_opt);
if (leftOver < 0)
{
thisIdent += leftOver;
}
sprintf (out_opt, "%*s%s", thisIdent, " ", hold);
nxt_opt = out_opt;
}
/* Prepare the option - split out the first cols[1] chars */
if (nxt_opt && *nxt_opt)
{
opt = nxt_opt;
if (opt && (strlen(opt) > cols[1]))
{
char c = opt[cols[1]];
opt[cols[1]] = '\0';
nxt_opt = (char*)strrchr(opt, ' ');
opt[cols[1]] = c;
if (nxt_opt)
{
*nxt_opt = '\0';
nxt_opt++;
if (! optIdent)
{
char* pSpace = (char*)strchr(opt, ' ');
if (pSpace && bHaveLong)
pSpace = (char*)strchr(pSpace+1, ' ');
if (pSpace)
optIdent = (unsigned long)(pSpace+1) -
(unsigned long)opt;
}
}
}
else
{
nxt_opt = NULL;
}
}
/* Prepare the description - split out the first cols[3] chars */
if (desc && *desc)
{
char* pNL = NULL;
desc = nxt_desc;
if (indent_nxt != -1)
{
indent = indent_nxt;
indent_nxt = -1;
}
else if (indent_hang != -1)
{
indent = indent_hang;
indent_hang = -1;
}
if (desc && (strlen(desc)+indent > cols[3]))
{
char c = desc[cols[3]-indent];
desc[cols[3]-indent] = '\0';
nxt_desc = (char*)strrchr(desc, ' ');
desc[cols[3]-indent] = c;
if (nxt_desc)
{
*nxt_desc = '\0';
nxt_desc++;
}
}
else
{
nxt_desc = NULL;
}
/* Allow '\n' in a description string (and handle it properly ;^) */
if (desc && ((pNL = strchr(desc, '\n')) != NULL))
{
/* We have a '\n'! */
if (nxt_desc)
{
nxt_desc--;
*nxt_desc = ' ';
}
nxt_desc = pNL;
*nxt_desc = '\0';
nxt_desc++;
/* Are the formatting instructions? */
if (*nxt_desc == '.')
{
/* YES! - Formatting = '.<indent>[:<hanging indent>].' */
indent_nxt = 0;
indent_hang = 0;
nxt_desc++;
indent_nxt = strtoul(nxt_desc, &nxt_desc, 0);
if (nxt_desc && (*nxt_desc == ':'))
{
nxt_desc++;
indent_hang = strtoul(nxt_desc, &nxt_desc, 0);
if (nxt_desc && (*nxt_desc == '.'))
nxt_desc++;
}
}
}
}
if ((opt && *opt) || (desc && *desc))
{
char opt_line[256];
sprintf(opt_line, "%*s%-*s%*s",
cols[0], " ",
cols[1], (opt && *opt ? opt : ""),
cols[2], " ");
write (hFile, opt_line, strlen(opt_line));
if (indent)
{
sprintf(opt_line, "%*s", indent, " ");
write (hFile, opt_line, strlen(opt_line));
}
sprintf(opt_line, "%-*s\n",
cols[3]-indent, (desc && *desc ? desc : "..."));
write (hFile, opt_line, strlen(opt_line));
}
}
if (lopt) free(lopt);
if (desc) free(desc);
}
/*
* Output usage information for the give 'parse_opts'
*/
static
void __opts_vprintf (int hFile,
parsed_opts opts[],
parsed_opts* pParent,
int level,
char* fmt,
va_list args)
{
int idex;
char opt_line[256];
int bFirst = 1;
int cols[4];
/* Copy in the global column settings */
memcpy(cols, opts_cols, sizeof(cols));
if (level)
{
if (cols[3] > 25)
{
cols[0] += level*2;
cols[3] -= level*2;
}
}
else if (fmt && args)
{
vsprintf(opt_line, fmt, args);
write (hFile, opt_line, strlen(opt_line));
}
/*
* First, output all modal options
*/
bFirst = 1;
for (idex = 0; ! NULL_OPT(opts[idex]); idex++)
{
if (! (opts[idex].flags & OPT_MODAL))
continue;
if (bFirst)
{
write (hFile, "\n", 1);
if (! pParent)
{
sprintf(opt_line, "Modal Options:\n");
}
else
{
char* parent = opt_str(pParent);
sprintf(opt_line, "%*sModal Suboptions%s%s:\n",
cols[0]-1, " ", (parent ? " for " : ""),
(parent ? parent : ""));
}
write (hFile, opt_line, strlen(opt_line));
bFirst = 0;
}
__opt_print(hFile, &(opts[idex]), cols);
if (opts[idex].subopts)
{
/* Recurse */
__opts_vprintf(hFile, opts[idex].subopts, &(opts[idex]),
level+1, fmt, args);
write(hFile, "\n", 1);
}
}
/*
* Second, output all non-modal options
*/
bFirst = 1;
for (idex = 0; ! NULL_OPT(opts[idex]); idex++)
{
if (opts[idex].flags & OPT_MODAL)
continue;
if (bFirst)
{
write (hFile, "\n", 1);
if (! pParent)
{
sprintf(opt_line, "Global Options:\n");
}
else
{
char* parent = opt_str(pParent);
sprintf(opt_line, "%*sNon-Modal Suboptions%s%s:\n",
cols[0]-1, " ", (parent ? " for " : ""),
(parent ? parent : ""));
}
write (hFile, opt_line, strlen(opt_line));
bFirst = 0;
}
__opt_print(hFile, &(opts[idex]), cols);
if (opts[idex].subopts)
{
/* Recurse */
__opts_vprintf(hFile, opts[idex].subopts, &(opts[idex]),
level+1, fmt, args);
write(hFile, "\n", 1);
}
}
if (! level)
{
/*
* Output our help/usage option.
*/
sprintf(opt_line, "%*s%-*s%*s%-*s\n\n",
cols[0], " ",
cols[1], "-?, --help",
cols[2], " ",
cols[3], "This help/usage message.");
write (hFile, opt_line, strlen(opt_line));
}
}
/*****************************************************************************
* Public interfaces
*/
char* opt_str (parsed_opts* pOpt)
{
static char str[128];
if (! pOpt)
return NULL;
str[0] = '\0';
if (pOpt->shortopts)
{
strcpy(str, "-");
strcat(str, pOpt->shortopts);
if (pOpt->longopts)
strcat(str, "|");
}
if (pOpt->longopts)
{
strcat(str, "--");
strcat(str, pOpt->longopts);
}
return str;
}
char* opts_parse (parsed_opts opts[],
int argc,
char** argv)
{
return __opts_parse(opts, 0, argc, argv);
}