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ppargs.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1986-2007 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * Glenn Fowler
 * AT&T Research
 *
 * common preprocessor command line argument parse
 * called by optjoin()
 */

static const char usage[] =
"[-?\n@(#)$Id: cpp (AT&T Research) 2007-03-11 $\n]"
USAGE_LICENSE
"[+NAME?cpp - C language preprocessor]"
"[+DESCRIPTION?\bcpp\b is the preprocessor for all C language dialects. It is"
"     a standalone version of the \blibpp\b(3) preprocessor library. The"
"     C dialect implemented by \bcpp\b is determined by probing \bcc\b(1)"
"     using \bprobe\b(1). The path of the emulated compiler can be changed"
"     by the \b-D-X\b command line option.]"
"[+?If \aoutput\a is omitted then the standard output is written; if \ainput\a"
"     is also omitted then the standard input is read. NOTE: this is an"
"     ancient, non-standard, non-intuitiive file operand syntax that is"
"     required by \bcc\b(1); use shell file name expansion at your peril.]"
"[+?\bcpp\b specific options are set by the \b-D-\b and \b-I-\b options.]"

"[C:comments?Pass comments to the output. By default comments are omitted.]"
"[D:define?Define the macro \aname\a to have \avalue\a; \b1\b is assumed if"
"     \b=\b\avalue\a is omitted. If \aname\a begins with \b:\b then it is"
"     interpreted as a \blibpp\b(3) \b#pragma pp:\b statement; if \aname\a"
"     begins with \b%\b then it is interpreted as a \blibpp\b(3) \b#\b"
"     directive statement; if \aname\a begins with \b-\b or \b+\b then it is"
"     interpreted as a \blibpp\b(3) option; \b-\b turns the option on,"
"     \b+\b turns it off. Most options have a \b#pragma\b counterpart that"
"     is listed with the option definition. Right, this is ugly, but its the"
"     only portable way to pass options through \bcc\b(1) to"
"     \bcpp\b:]:[name[=value]]]{"
"     [+-D-C, pp::compatibility?Preprocess for K&R compatibility.]"
"     [+-D-D\alevel\a, \bpp::debug\b \alevel\a?Set the debug trace level."
"           Higher levels produce more output. Levels higher than 3"
"           enabled only in \b-g\b compiled versions.]"
"     [+-D-F\aname\a?Set the main input file name to \aname\a. This only"
"           affects error message and line sync output.]"
"     [+-D-H, pp::hosted?All directories are hosted; compatibility"
"           warning messages from hosted directory headers are suppressed.]"
"     [+-D-I, pp::cdir?All directories contain C headers; used only with"
"           \b-D-+\b.]"
"     [+-D-K, pp::keyargs?Enable the non-standard \aname=value\a macro"
"           argument mode.]"
"     [+-D-L\b[\aid\a]], \bpp::lineid\b [\aid\a]]?Set the line sync directive"
"           id to \aid\a or null if omitted.]"
"     [+-D-M, pp::nomultiple?Disable multiple include detection.]"
"     [+-D-P, pp::passthrough?Enable the non-standard passthrough mode; may"
"           be useful for processing non-C input.]"
"     [+-D-Q, pp::dump?Dump macro definitions to the output so that the"
"           output may be passed through \bcpp\b again. Used for"
"           generating precompiled headers.]"
"     [+-D-R, pp::transition?Enable the transition preprocessing mode. Used"
"           for compilers that can't make up their semantics between"
"           K&R and ISO.]"
"     [+-D-S, pp::strict?Enable strict preprocessing semantics and warnings."
"           Works with any mode (compatibiliy, transition,"
"           or the default ISO).]"
"     [+-D-T\atest\a, \bpp::test\b \atest\a?Enable implementation specific"
"           test code according to \atest\a.]"
"     [+-D-W, pp::warn?Enable warnings in non-hosted files.]"
"     [+-D-X\b[\acc\a]]?Preprocess for the compiler \acc\a which must be"
"           an executable path or an executable on \b$PATH\b.]"
"     [+-D-Y, pp::pedantic?Enable pedantic \bpp::warn\b warnings in"
"           non-hosted files.]"
"     [+-D-Z, pp::pool?Enable pool mode. See \blibpp\b(3).]"
"     [+-D-d?List canonicalized \b#define\b statements for non-predefined"
"           macros in the output. ]"
"     [+-D-m?List canonicalized \b#define\b statements for all macros. All"
"           other output is disabled.]"
"     [+-D-+, pp::plusplus?Preprocess for the C++ dialect.]"
"}"
"[I:include?Append \adirectory\a to the list of directories searched for"
"     \b#include\b files. If \adirectory\a is \b-\b then: (1) \b-I\b"
"     directories before \b-I-\b are searched only for \"...\" include"
"     files; (2) \b-I\b directories after \b-I-\b are searched for"
"     \"...\" and <...> include files; (3) the directory \b.\b is searched"
"     only if it is explicitly specified by a \b-I\b option.]:?[directory]{"
"     [+-I-C\adirectory\a, \bpp::cdir\b \adirectory\a?Mark \adirectory\a"
"           as a C header directory. Used with \bpp:plusplus\b.]"
"     [+-I-D[\afile\a]]?Read the default \bprobe\b(1) definitions from"
"           \afile\a, or ignore the default definitions if \afile\a"
"           is omitted.]"
"     [+-I-H\adirectory\a, \bpp::hostdir\b \adirectory\a?Mark \adirectory\a"
"           as a hosted directory. Headers from hosted directories have"
"           compatibility warnings disabled.]"
"     [+-I-I\aheader\a, \bpp::ignore\b \aheader\a?Add \aheader\a to the"
"           list of ignored headers.]"
"     [+-I-M\afile\a?\afile\a contains a sequence of \aheader\a"
"           [= \"\amap\a\" ]] lines, where \aheader\a is either <\aname\a>"
"           or \"\aname\a\", and \"\amap\a\" is an explicit binding"
"           for \aheader\a. \aheader\a is ignored if = \"\amap\a\" is"
"           omitted.]"
"     [+-I-R\afile\a?Include \afile\a but do not emit text or line syncs.]"
"     [+-I-S\adirectory\a?Add \adirectory\a to the default standard include"
"           directory list.]"
"     [+-I-T\afile\a?Include \afile\a and emit text to the output file.]"
"}"
"[M:dependencies?Generate \bmake\b(1) dependencies. Not needed with"
"     \bnmake\b(1). \b-M\b may be followed by optional \aflags\a to change"
"     dependency output styles:]{"
"     [+D?Generate dependencies in a separate \b.d\b file. Preprocessed"
"           output is still written to \aoutput\a, or the standard output"
"           if \aoutput\a is omitted.]"
"     [+G?Generate missing dependencies too.]"
"     [+M?Only generate local header dependencies; \ahosted\a headers are"
"           omitted. Note that \ahosted\a headers are determined by"
"           \b-I-H\b and the \bpp:hosted\b and \bpp:hostdir\b pragmas;"
"           no special distiction is made between \"\" and <> \binclude\b"
"           styles.]"
"}"
"[P!:sync?Emit line syncs.]"
"[U:undefine?Remove the definition for the macro \aname\a.]:[name]"

"[A:assert?Enter the assertion via \b#assert\b for system V"
"     compatibility.]:[assertion]"
"[E:preprocess?Ignored for compatibility with ancient compilers.]"
"[H:include-reference?Emit \b#include\b file paths on the standard error,"
"     one per line, indented to show nesting.]"
"[T?If not \bgcc\b(1) then truncate identifiers to \alength\a"
"     characters for compatibility with old AT&T (I guess only Lucent needs"
"     them now) compilers.]#?[length]"
"[V:version?Emit the \blibpp\b(3) version.]"
"[X:argmode?Enable \aname\a=\avalue\a macro arguments for \beasel\b(1)"
"     compatibility.]"
"[Y:standard?Add \adirectory\a to the list searched for"
"     \b#include\b \b<...>\b files.]:[directory]"

"\n"
"\n[ input [ output ] ]\n"
"\n"

"[+SEE ALSO?\bcc\b(1), \bgcc\b(1), \blibpp\b(3)]"
;

#include "pplib.h"

#include <ctype.h>

/*
 * convert lint comments to pragmas
 */

static void
pplint(char* head, char* comment, char* tail, int line)
{
      NoP(line);
      if (strmatch(comment, "(ARGSUSED|PRINTFLIKE|PROTOLIB|SCANFLIKE|VARARGS)*([0-9])|CONSTCOND|CONSTANTCOND|CONSTANTCONDITION|EMPTY|FALLTHRU|FALLTHROUGH|LINTLIBRARY|LINTED*|NOTREACHED"))
      {
            strncopy(pp.token, comment, MAXTOKEN);
            ppprintf("\n#%s %s:%s\n", dirname(PRAGMA), pp.pass, pp.token);
            ppline(error_info.line, NiL);
      }
}

/*
 * if last!=0 then argv[opt_info.index]==0 with return(0)
 * else if argv[opt_info.index]==0 then return(0)
 * otherwise argv[opt_info.index] is the first unrecognized
 * option with return(1)
 *
 * use last=0 if the preprocessor is combined with other passes
 * so that unknown options may be interpreted for those passes
 */

int
ppargs(char** argv, int last)
{
      register char*    s;
      register int      c;
      register int      n;
      char*       p;

      /*
       * check the args and initialize
       */

      if (!error_info.id)
            error_info.id = "cpp";
      for (;;)
      {
            for (; c = optget(argv, usage); last = 0) switch (c)
            {
            case 'C':
                  ppop(PP_COMMENT, ppcomment);
                  break;
            case 'D':
                  /*
                   * this allows single arg pp option extensions
                   * without touching cc
                   * (not all cc wrappers have -W...)
                   */

                  switch (*(s = opt_info.arg))
                  {
                  case '-':
                  case '+':
                        n = (*s++ == '-');
                        while (c = *s++) switch (c)
                        {
                        case 'C':
                              ppop(PP_COMPATIBILITY, n);
                              break;
                        case 'D':
                              if (n && ((c = strtol(s, &p, 0)) || p != s))
                              {
                                    s = p;
                                    n = c;
                              }
                              ppop(PP_DEBUG, -n);
                              break;
                        case 'F':
                              ppop(PP_FILENAME, n ? s : NiL);
                              goto hasarg;
                        case 'H':
                              ppop(PP_HOSTDIR, "-", n);
                              break;
                        case 'I':
                              ppop(PP_CDIR, "-", n);
                              break;
                        case 'K':
                              ppop(PP_KEYARGS, n);
                              break;
                        case 'L':
                              ppop(PP_LINEID, n && *s ? s : "line");
                              goto hasarg;
                        case 'M':
                              ppop(PP_MULTIPLE, !n);
                              break;
                        case 'P':
                              ppop(PP_PASSTHROUGH, n);
                              break;
                        case 'Q':
                              ppop(PP_DUMP, n);
                              break;
                        case 'R':
                              ppop(PP_TRANSITION, n);
                              break;
                        case 'S':
                              ppop(PP_STRICT, n);
                              break;
                        case 'T':
                              ppop(PP_TEST, s);
                              goto hasarg;
                        case 'V':
                              ppop(PP_VENDOR, "-", n);
                              break;
                        case 'W':
                              ppop(PP_WARN, n);
                              break;
                        case 'X':
                              ppop(PP_PROBE, n && *s ? s : 0);
                              goto hasarg;
                        case 'Y':
                              ppop(PP_PEDANTIC, n);
                              break;
                        case 'Z':
                              ppop(PP_POOL, n);
                              break;
                        case 'd':
                              pp.option |= DEFINITIONS;
                              break;
                        case 'm':
                              pp.state |= NOTEXT;
                              pp.option |= KEEPNOTEXT|DEFINITIONS|PREDEFINITIONS;
                              pp.linesync = 0;
                              break;
                        case '+':
                              ppop(PP_PLUSPLUS, n);
                              break;
                        default:
                              if (pp.optarg)
                              {
                                    if ((c = (*pp.optarg)(n, c, s)) > 0) goto hasarg;
                                    else if (!c) break;
                              }
                              error(1, "%c%s: unknown -D option overload", n ? '-' : '+', s - 1);
                              goto hasarg;
                        }
                  hasarg:
                        break;
                  case ':':
                        ppop(PP_OPTION, s + 1);
                        break;
                  case '%':
                        ppop(PP_DIRECTIVE, s + 1);
                        break;
                  case '_':
                        if (strmatch(s, "__GNUC__*"))
                              pp.arg_style |= STYLE_gnu;
                        else if (strmatch(s, "__(ANSI|STDC|STRICT)__*") || !(pp.arg_style & STYLE_gnu) && strmatch(s, "__STRICT_ANSI__*"))
                              ppop(PP_STRICT, 1);
                        else if (strmatch(s, "__cplusplus*"))
                              ppop(PP_PLUSPLUS, 1);
                        /*FALLTHROUGH*/
                  default:
                        ppop(PP_DEFINE, s);
                        break;
                  }
                  break;
            case 'E':
                  /* historically ignored */
                  break;
            case 'I':
                  if (!(s = opt_info.arg))
                  {
                        /*
                         * some compilers interpret `-I ...' as
                         * `-I-S' and arg ... while others interpret
                         * it as `-I...'
                         */

                        p = "-S";
                        if ((s = argv[opt_info.index]) && ((n = *s++) == '-' || n == '+') && *s++ == 'D')
                        {
                              if (isalpha(*s) || *s == '_')
                                    while (isalnum(*++s) || *s == '_');
                              if (*s && *s != '=' && *s != '-' && *s != '+')
                                    p = argv[opt_info.index++];
                        }
                        s = p;
                  }
                  switch (*s)
                  {
                  case '-':
                  case '+':
                        n = *(p = s++) == '-';
                        c = *s++;
                        if (!n && !*s) s = 0;
                        switch (c)
                        {
                        case 0:
                              ppop(PP_LOCAL);
                              break;
                        case 'C':
                              ppop(PP_CDIR, s, n);
                              break;
                        case 'D':
                              ppop(PP_DEFAULT, s);
                              break;
                        case 'H':
                              ppop(PP_HOSTDIR, s, n);
                              break;
                        case 'I':
                              ppop(PP_IGNORE, s);
                              break;
                        case 'M':
                              ppop(PP_IGNORELIST, s);
                              break;
                        case 'R':
                              ppop(PP_READ, s);
                              break;
                        case 'S':
                              ppop(PP_STANDARD, s);
                              break;
                        case 'T':
                              ppop(PP_TEXT, s);
                              break;
                        case 'V':
                              ppop(PP_VENDOR, s, n);
                              break;
                        default:
                              error(1, "%s: unknown -I option overload", p);
                              break;
                        }
                        break;
                  default:
                        ppop(PP_INCLUDE, s);
                        break;
                  }
                  break;
            case 'M':
                  for (n = PP_deps; argv[opt_info.index]; opt_info.offset++)
                  {
                        switch (argv[opt_info.index][opt_info.offset])
                        {
                        case 'D':
                              n |= PP_deps_file;
                              continue;
                        case 'G':
                              n |= PP_deps_generated;
                              continue;
                        case 'M':
                              n |= PP_deps_local;
                              continue;
                        }
                        break;
                  }
                  ppop(PP_FILEDEPS, n);
                  break;
            case 'P':
                  ppop(PP_LINE, (PPLINESYNC)0);
                  break;
            case 'U':
                  ppop(PP_UNDEF, opt_info.arg);
                  break;

            /*
             * System V CCS compatibility
             */

            case 'A':
                  if (isalpha(opt_info.arg[0]) || opt_info.arg[0] == '_' || opt_info.arg[0] == '$')
                        ppop(PP_ASSERT, opt_info.arg);
                  break;
            case 'H':
                  ppop(PP_INCREF, ppincref);
                  break;
            case 'T':
                  if (!(pp.arg_style & STYLE_gnu))
                        ppop(PP_TRUNCATE, TRUNCLENGTH);
                  /* else enable ANSI trigraphs -- default */
                  break;
            case 'V':
                  error(0, "%s", pp.version);
                  break;
            case 'X':
                  pp.arg_mode = (*(opt_info.arg + 1) || pp.arg_mode && pp.arg_mode != *opt_info.arg) ? '-' : *opt_info.arg;
                  break;
            case 'Y':
                  if (*(s = opt_info.arg) && *(s + 1) == ',')
                  {
                        if (*s != 'I') break;
                        s += 2;
                  }
                  ppop(PP_STANDARD, s);
                  break;

            /*
             * errors
             */

            case '?':
                  error(ERROR_USAGE|4, "%s", opt_info.arg);
                  break;
            case ':':
                  if (!last)
                  {
                        opt_info.again = 1;
                        return(1);
                  }

                  /*
                   * cross your fingers
                   */

                  if (!(s = argv[opt_info.index]))
                        error(3, "%s", opt_info.arg);
                  if (opt_info.offset == 2 && (pp.arg_style & STYLE_gnu))
                  {
                        p = argv[opt_info.index + 1];
                        if (streq(s, "-$"))
                        {
                              ppop(PP_OPTION, "noid \"$\"");
                              goto ignore;
                        }
                        else if (streq(s, "-dD"))
                        {
                              pp.option |= DEFINITIONS;
                              goto ignore;
                        }
                        else if (streq(s, "-dM"))
                        {
                              pp.state |= NOTEXT;
                              pp.option |= KEEPNOTEXT|DEFINITIONS|PREDEFINITIONS;
                              pp.linesync = 0;
                              goto ignore;
                        }
                        else if (streq(s, "-imacros"))
                        {
                              if (p)
                              {
                                    ppop(PP_READ, p);
                                    opt_info.index++;
                                    opt_info.offset = 0;
                              }
                              goto ignore;
                        }
                        else if (streq(s, "-include"))
                        {
                              if (p)
                              {
                                    ppop(PP_TEXT, p);
                                    opt_info.index++;
                                    opt_info.offset = 0;
                              }
                              opt_info.offset = 0;
                              goto ignore;
                        }
                        else if (strneq(s, "-lang-", 6))
                        {
                              s += 6;
                              if (streq(s, "c"))
                                    c = 0;
                              else if (streq(s, "c++"))
                                    c = 1;
                              else if (streq(s, "objc"))
                                    c = 2;
                              else if (streq(s, "objc++"))
                                    c = 3;
                              ppop(PP_PLUSPLUS, c & 1);
                              if (c & 2)
                                    ppop(PP_DIRECTIVE, "pragma pp:map \"/#(pragma )?import>/\" \"/#(pragma )?import(.*)/__STDPP__IMPORT__(\\2)/\"\n\
#macdef __STDPP__IMPORT__(x)\n\
#pragma pp:noallmultiple\n\
#include x\n\
#pragma pp:allmultiple\n\
#endmac");
                              goto ignore;
                        }
                        else if (streq(s, "-lint"))
                        {
                              ppop(PP_COMMENT, pplint);
                              goto ignore;
                        }
                  }
                  s += opt_info.offset - 1;
                  if (strmatch(s, "i*.h"))
                        ppop((pp.arg_style & STYLE_gnu) || s[1] == '/' ? PP_READ : PP_TEXT, s + 1);
                  else if (strmatch(s, "*@(nostandard|nostdinc)*"))
                        ppop(PP_STANDARD, "");
                  else if (strmatch(s, "*@(exten|xansi)*|std"))
                  {
                        ppop(PP_COMPATIBILITY, 0);
                        ppop(PP_TRANSITION, 1);
                  }
                  else if (strmatch(s, "*@(ansi|conform|pedantic|stand|std1|strict[!-])*"))
                  {
                        ppop(PP_COMPATIBILITY, 0);
                        ppop(PP_STRICT, 1);
                        if (strmatch(s, "*pedantic*"))
                              ppop(PP_PEDANTIC, 1);
                  }
                  else if (strmatch(s, "*@(trans)*"))
                  {
                        ppop(PP_COMPATIBILITY, 1);
                        ppop(PP_TRANSITION, 1);
                  }
                  else if (strmatch(s, "*@(classic|compat|std0|tradition|[kK][n&+][rR])*"))
                  {
                        ppop(PP_COMPATIBILITY, 1);
                        ppop(PP_TRANSITION, 0);
                  }
                  else if (strmatch(s, "*@(plusplus|++)*"))
                        ppop(PP_PLUSPLUS, 1);
                  else if (strmatch(s, "*@(warn)*"))
                        ppop(PP_WARN, 1);

                  /*
                   * ignore unknown options
                   * the probe info takes care of these
                   * fails if an option value is in the next arg
                   * and this is the last option
                   */

                  if (argv[opt_info.index + 1] && argv[opt_info.index + 1][0] != '-' && argv[opt_info.index + 2] && argv[opt_info.index + 2][0] == '-')
                  {
                        opt_info.index++;
                        opt_info.offset = 0;
                  }
            ignore:
                  while (argv[opt_info.index][opt_info.offset]) opt_info.offset++;
                  break;
            }
            if (!(s = argv[opt_info.index])) return(0);
            switch (pp.arg_file)
            {
            case 0:
                  if (*s != '-' || *(s + 1)) ppop(PP_INPUT, s);
                  break;
            case 1:
                  if (*s != '-' || *(s + 1)) ppop(PP_OUTPUT, s);
                  break;
            default:
                  if (!last) return(1);
                  error(1, "%s: extraneous argument ignored", s);
                  break;
            }
            pp.arg_file++;
            if (!argv[++opt_info.index]) return(0);

            /*
             * old versions allow options after file args
             */
      }
}

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