File: prcc.c

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/* prcc.c: This file contains the parser for the calls command. */

/* This program is a modification of Steve Kirkendall's ctags(1) which
 * is distributed as part of his vi-clone elvis.  It is contributed
 * to the public domain by Andrew Moore of Talke Studio. */

static char *id = "$Id: prcc.c,v 1.4 1995/02/16 05:35:57 leisner Exp $";
static char *version = "$Revision: 1.4 $";

#include <stdio.h>
#include <ctype.h>

#include <string.h>
#include <stdlib.h>
#include <assert.h>

#include <getopt.h>

typedef enum { FALSE=0, TRUE=1 } BOOLEAN;

#ifndef PATH_MAX
#define PATH_MAX 1024
#endif


typedef struct ns {		/* name structure */
	struct ns *next;
	char *name;
} name_t;

/* maximum identify length... */
#ifndef NAME_MAX
#define NAME_MAX	32
#endif
#define TAG_MAX (NAME_MAX * 2 + PATH_MAX + 20)	/* maximum tag length */
#define TAG_STACKSIZE 20	/* tag stack size */

#include 	"prcc.prototypes.h"



/* The following boolean variables are set according to command line flags */
static int incl_vars;		/* -v include variables */
static int gnu_keywords;	/* -g deletes GNU keywords */
static int posix_keywords;	/* -p deletes posix keywords */
static int ansi_keywords;	/* -a deletes ansi keywords */

/* These are used for reading a source file.  It keeps track of line numbers */
static char file_name[PATH_MAX];	/* name of the current file */
static FILE *file_fp;		/* stream used for reading the file */
static long file_lnum;		/* line number in the current file */
static int file_afternl;	/* boolean: was previous character a newline? */
static int file_prevch;		/* a single character that was ungotten */

static void show_all_lists(void);

static char *progname;

static char lex_name[NAME_MAX+1];	/* the name of a "NAME" token */

static void usage(void)
{
	fprintf(stderr, "%s [-akgvp] [files]\n", progname);
	fprintf(stderr, "\t-a\tdelete ansi keywords\n");
	fprintf(stderr, "\t-g\tdelete gnu keywords\n");
	fprintf(stderr, "\t-p\tdelete posix keywords\n");
	fprintf(stderr, "\t-v\tinclude variables\n");
	fprintf(stderr, "\t-k\tprint names to stdout and exit\n");
	exit(2);
}

void main(int argc, char **argv)
{
	extern int optind;
	extern char *optarg;
	int c;

	progname = argv[0];

	/* parse the option flags */
	while (1) {
		c = getopt(argc, argv, "pakgv");
		if (c == -1)
			break;
		switch (c) {
		    case 'k':
			    show_all_lists();
			    exit(1);
		    case 'g':
			    gnu_keywords = TRUE;
			    break;
		    case 'a':
			    ansi_keywords = TRUE;
			    break;
		    case 'p':
			    posix_keywords = TRUE;
			    break;
		    case 'v':
			    incl_vars = TRUE;
			    break;
		    default:
			    usage();
		}
	}

	argv += optind;
	do {
		/* can't open file */
		if (!cpp_open(*argv ? *argv++ : "-")) {
			break;	/* least the error goes unnoticed */
		}
		/* initialize name lists */
		per_file_init();

		/* process file */
		ctags();

		/* free name lists */
		per_file_cleanup();
	} while (*argv);

	/* flush tag stack */
	maketag(0, 0);
	exit(0);
	/*NOTREACHED */
}


/* -------------------------------------------------------------------------- */
/* This is the parser.  It locates tag candidates, and then decides
 * whether to generate a tag for them. */

/* These are C tokens after which a parenthesis is valid
 * which would otherwise be tagged as function names. The
 * reserved words which are not listed are break, continue,
 * default and goto.  */
static char *reserved[] =
{
	"extern", 
	"auto", "case", "char", "const", "do", "double", "else",
	"entry", "enum", "extern", "float", "for", 
	"if", "int", "long", "register", "return", "short",
	"signed", "sizeof", "static", "struct", "switch", "typedef",
	"union", "unsigned", "void", "volatile", "while",
	0
};

static char *gnu_reserved[] =
{
	"asm", "__asm__",
	"__attribute__",	
	"__complex__",
	"__real__",
	"__imag__",
	"__const__",
	"__extension__",
	"inline", "__inline__",
	"__label__",
	"__signed__",
	"typeof", "__typeof__",
	"__volatile__",
	0
};

/* this also includes bsd'isms...not really exact, but
 * good enough 
 */
static char *posix_reserved[] =
{
	"access", "alarm", "brk", "chdir",
	"chmod", "chown", "fchmod",
	"close", "closedir",
	"creat",
	"ctermid", "cuserid",
	"dup", "dup2",
	"execl", "execle", "execlp", "execlpe",
	"execv", "execve", "execvp", "execvpe",
	"_exit",
	"errno",
	"fdopen",
	"fstat",
	"fork",
	"getcwd", "getegid", "getenv", "geteuid", "getgid", "getgrent",
	"getprgid", "getgrnam", "getlogin", "getpass", "getpgrp",
	"getpid", "getppid", "getpwent", "getpwnam", "getpwuid", "getuid",
	"ioctl",
	"isatty",
	"kill",
	"link", "lseek", "mkdir", "mkfifo", "mknod",
	"read",
	"open",
	"opendir", "pause", "pipe", "readdir",
	"perror",
	"popen", "pclose",
	"rmdir", "rename", "unlink",
	"sbrk", "setuid", "signal", "sleep", "stat",
	"time", "times", "ttyname", "umask", "uname",
	"unlink",
	"ustat", "utime",
	"sigaction",
	"write",
	0
};

static char *ansi_reserved[] =
{
	"atexit",
	"exit",

	/* stdio function */
	"fflush",
	"fopen",
	"fclose",
	"fread", "fwrite",
	"fprintf",
	"fgets",
	"fputs",
	"fscanf",
	"printf",
	"putchar",
	"putc", "fputc", "puts",
	"scanf",
	"signal",
	"system",
	"sscanf",
	"sprintf",
	"vfprintf",
	"vprintf",

	/* string functions */
	"index", "rindex", "bcopy",
	"strcat", "strncat", "strlen", "strcpy", "strncpy",
	"strchr", "strrchr",
	"strdup", "strcmp", "strncmp", "strncasecmp", "strcasecmp",
	/* math functions */
	/* memory functions */
	"malloc", "realloc", "calloc", "free",
	"memcpy", "memmove",
	0


};

/* list of reserved words */
static name_t *keyword;

enum lex_tokens {		/* token types */
	DELETED,
	BODY,
	BODYEND,
	LBRACKET,
	RBRACKET,
	ARGS,
	ARGSEND,
	COMMA,
	SEMICOLON,
	COLON,
	KSTATIC,
	KEXTERN,
	KSTRUCT,
	KTYPEDEF,
	TYPESPEC,
	NAME,
	STRUREF,
	ASSIGN,
	OPERATOR
};


/* Basic types for initializing type specifier list */
static char *type[] =
{
	"char", "double", "enum", "float", "int", "long", "short",
	"signed", "struct", "union", "unsigned", "void",
	0
};

/* A type specifer list prevents declarations such as: int (*func())();
 * from being parsed as calls */
static name_t *type_specifier;

/* A functions-previously-defined list assures that functions are defined
 * only once. */
static name_t *func_defined;

/* A functions/variables-previously-called list assures that calls are
 * printed only once per function definition. */
static name_t *per_func_ref;

/* Three variables lists to track global/extern/local variable
 * declarations. */
static name_t *variable;
static name_t *extern_var;
static name_t *per_func_var;

static int gotname;		/* boolean: does lex_name contain a tag candidate? */
static int blockno;		/* marks the extent of a scope */
static int listno;		/* marks the extent of a parameter list */
static int func_seen;		/* boolean: true if function is redefined */

/* This function parses a source file and prints function calls. */
static void ctags(void)
{
	int initializer = FALSE;	/* initialization list */
	int prev;		/* the previous token from the source file */
	int token = SEMICOLON;	/* the current token from the source file */
	int scope = 0;		/* normally 0, but could be KTYPEDEF or KSTATIC */
	int scopeno = 0;	/* block number upon entering a scope */
	int structdeclr = FALSE;	/* struct/union/enum declaration */
	int structno = 0;	/* block number upon entering struct */
	int typedeclr = FALSE;	/* type declaration */

	/* reset */
	gotname = FALSE;

	/* parse until the end of the file */
	while (prev = token, (token = lex_gettoken()) != EOF) {
		/* scope keyword? */
		if (token == KTYPEDEF || token == KSTATIC || token == KEXTERN) {
			/* set scope */
			scope = token;
			scopeno = blockno;
			gotname = FALSE;
			continue;
		}
		/* type declaration */
		if (token == KSTRUCT || token == TYPESPEC) {
			typedeclr = TRUE;
			gotname = FALSE;
			continue;
		}
		/* (not STRUREF) NAME: NAME is tag? */
		if (token == NAME && prev != STRUREF && prev != KSTRUCT) {
			gotname = TRUE;
			continue;
		}
		/* ASSIGN BODY: initilizer */
		if (token == BODY && prev == ASSIGN) {
			gotname = FALSE;

			/* global */
			if (blockno == 1) {
				initializer = TRUE;
			}
			continue;
		}
		/* [NAME] BODY (no ARGS): struct declr [NAME is a struct tag] */
		if (token == BODY && prev != ARGS) {
			gotname = FALSE;

			/* not already in struct/union/enum */
			if (!structdeclr) {
				structno = blockno;
			}
			structdeclr = TRUE;
			continue;
		}
		/* NAME ARGS BODY: NAME is function */
		if (gotname && prev == ARGS && token == BODY) {
			gotname = FALSE;
			typedeclr = FALSE;
			structdeclr = FALSE;

			/* no name clash */
			if (!(func_seen = name_redefined(0))) {
				/* KSTATIC okay -- make a tag */
				maketag(scope, 0);
			}
			scope = 0;
			continue;
		}
		/* NAME ARGS in BODY (not global initializer):
		 * NAME is function call? */
		if (gotname && token == ARGS && blockno && !initializer) {
			gotname = FALSE;

			/* not function declaration */
			if (!typedeclr) {
				/* make a tag */
				maketag(scope, 1);
			}
			continue;
		}
		/* TYPE ARGSEND: type cast */
		if (typedeclr && !gotname && token == ARGSEND) {
			typedeclr = FALSE;
			continue;
		}
		/* KTYPEDEF NAME (not struct tag): new type specifier */
		if (gotname && scope == KTYPEDEF && !structdeclr) {
			gotname = FALSE;

			/* global */
			if (!blockno) {
				/* no name clash */
				if (!name_redefined(0)) {
					/* add specifier to type list */
					name_to_list(&type_specifier, lex_name);
				}
			}
		}
		/* TYPE NAME (no ARGS) [SEMICOLON,COMMA,ARGSEND,ASSIGN]:
		 * NAME is type declr */
		if (typedeclr && gotname && prev != ARGS && (token == SEMICOLON
		 || token == COMMA || token == ARGSEND || token == ASSIGN
			    || token == LBRACKET || token == OPERATOR)) {
			gotname = FALSE;

			/* global */
			if (!blockno) {
				/* -v flag and not extern and (no name clash ||
				 * name only extern) [name on extern variable
				 * list is removed] */
				if (incl_vars && scope != KEXTERN
				    && (!name_redefined(1) || name_in_list(extern_var)
					&& name_from_list(&extern_var))) {
					/* make a tag */
					maketag(ASSIGN, 0);
				}
				/* (not -v flag || extern) && no name clash */
				else if ((!incl_vars || scope == KEXTERN)
					 && !name_redefined(1)) {
					/* add name to global variables list */
					name_to_list(&extern_var, lex_name);
				}
			}
			/* not in struct/union/enum and no name clash */
			else if (!structdeclr && !name_in_list(per_func_var)) {
				/* add name to per-function variables list */
				name_to_list(&per_func_var, lex_name);
			}
		}
		/* (no TYPE) NAME in BODY (not global initializer):
		 * var/label reference */
		if (!typedeclr && gotname && blockno && !initializer) {
			gotname = FALSE;

			/* -v flag set and global variable reference */
			if (incl_vars && (name_in_list(variable) || name_in_list(extern_var))) {
				maketag(NAME, 0);
			}
		}
		/* delimiter */
		if (token == OPERATOR || token == ASSIGN || token == BODYEND
		  || token == ARGSEND || token == COLON || token == COMMA
		    || token == LBRACKET || token == RBRACKET) {
			gotname = FALSE;

			/* assignment */
			if (token == ASSIGN) {
				/* reset */
				typedeclr = FALSE;

			}
			/* body end and end of struct definition */
			if (token == BODYEND && structno == blockno + 1) {
				/* reset */
				structdeclr = FALSE;
			}
			/* end of global compound */
			if (token == BODYEND && !blockno) {
				/* reset */
				initializer = FALSE;
				func_seen = 0;
				free_list(&per_func_var);
				free_list(&per_func_ref);
			}
			continue;
		}
		/* semicolon */
		if (token == SEMICOLON) {
			/* reset */
			gotname = FALSE;
			typedeclr = FALSE;

			/* end of scope */
			if (scopeno == blockno) {
				scope = 0;
			}
		}
		/* The source file will be automatically closed */
	}
}


/* This function generates a tag for the object in lex_name */
static void maketag(int scope, int iscall)
			/* 0 if global, or KSTATIC if static */
			/* function call? */
{
	static char caller_name[NAME_MAX];	/* name of caller function */
	char tag[TAG_MAX], buf[TAG_MAX];	/* tag buffers */

	/* external declaration or lex_name is a keyword */
	if (func_seen || scope == KEXTERN || name_in_list(per_func_ref)) {
		/* whoa!  never output tag for redefined function or
		 * an extern declr or  keyword, and only output a tag
		 * for variable/call reference once per function */
		return;
	}
	/* global variable declaration */
	if (scope == ASSIGN) {
		/* add name to global variables list */
		name_to_list(&variable, lex_name);
	}
	/* variable reference */
	else if (scope == NAME) {
		/* add lex_name to calls made in this function */
		name_to_list(&per_func_ref, lex_name);
	}
	/* new function definition */
	else if (!iscall) {
		/* update caller function name */
		strcpy(caller_name, lex_name);

		/* add name to function defined list */
		name_to_list(&func_defined, lex_name);
	}
	/* function call */
	else {
		/* add lex_name to references made in this function */
		name_to_list(&per_func_ref, lex_name);
	}

	/* make tag */
	sprintf(tag, iscall ? "%s\t%s\t{}"
		: (scope == NAME) ? "%s\t%s\t{v}"
		: (scope == ASSIGN) ? "%s\t%s\t{v %s %ld}"
		: "%s\t%s\t{%s %ld}",
		(scope == ASSIGN) ? lex_name
		: caller_name, lex_name, file_name, file_lnum);

	/* nested call */
	if (listno) {
		/* push new tag onto tag stack */
		tag_push(tag);
	}
	/* function definition or first call in current expression */
	else {
		/* first call in expression */
		if (iscall) {
			listno = 1;
		}
		/* print tags from previous expression */
		while (tag_pop(buf)) {
			printf("%s\n", buf);
		}

		/* push new tag onto tag stack */
		tag_push(tag);
	}
}

static char *tag_stack[TAG_STACKSIZE];
static int tag_sp = 0;

/* pushes buffer onto tag stack */
static tag_push(char *b)
{
	if (tag_sp < TAG_STACKSIZE
	&& (tag_stack[tag_sp] = (char *) malloc(strlen(b) + 1)) != NULL) {
		strcpy(tag_stack[tag_sp++], b);
		return 1;
	}
	return 0;
}

/* pops value off tag stack to buffer */
static tag_pop(char *b)
{
	if (tag_sp) {
		strcpy(b, tag_stack[--tag_sp]);
		free(tag_stack[tag_sp]);
		return 1;
	}
	return 0;
}



/* -------------------------------------------------------------------------- */
/* This is the lexical analyser.  It gets characters from the
 * preprocessor, and gives tokens to the parser.  Some special codes
 * are...
 * 
 * (deleted)  / *...* / (comments)
 * (deleted) //...\n    (comments)
 * (deleted) [...]      (array subscript, when ... contains no ])
 * BODY {               ('{' can occur anywhere)
 * BODYEND }            (end of a body)
 * LBRACKET [           ()
 * LBRACKET ]           ()
 * ARGS (               (in function block, args of a function call)
 * ARGSEND )            (end of args)
 * ARGS (...{           (args of a function defintion --- ANSI or K&R)
 * ARGS (...)...;       (args of an extern/forward function declaration)
 * ARGS (...)...,       (args of an extern/forward function declaration)
 * ARGS (...]...,       (args of an extern/forward function declaration)
 * COMMA ,              (separate declarations that have same scope)
 * SEMICOLON ;          (separate declarations that have different scope)
 * KSTRUCT struct       ()
 * KSTRUCT union        ()
 * KSTRUCT enum         ()
 * KTYPEDEF typedef     (the "typedef" keyword)
 * KSTATIC static       (the "static" keyword)
 * KSTATIC private      (the "static" keyword)
 * KSTATIC PRIVATE      (the "static" keyword)
 * KEXTERN extern       (the "extern" keyword)
 * KEXTERN extern       (the "extern" keyword)
 * STRUREF .            (direct structure reference operator)
 * STRUREF ->           (indirect structure reference operator)
 * ASSIGN =             (assignment operator, esp. initializer)
 * OPERATOR             (any constant or operator or part of an operator)
 * TYPESPEC [a-z]+      (type specifier, including typedefs)
 * NAME [a-z]+          (really any valid name that isn't reserved word) */

/* returns token of next item in input */
static lex_gettoken(void)
{
	static int expanded = 0;	/* boolean: ARGSEND expanded? */

	int ch;			/* a character from the preprocessor */
	int oc;			/* previous character from the preprocessor */
	int token;		/* the token that we'll return */
	int lp = 0;		/* lex_name index */

	/* loop until we get a token that isn't "DELETED" */
	do {
		/* process the character */
		switch (ch = cpp_nonwhite()) {
		    case ',':
			    token = COMMA;
			    break;

		    case ';':
			    token = SEMICOLON;
			    break;

		    case ':':
			    token = COLON;
			    break;

		    case '\'':
			    /* skip to matching '\'' */
			    while ((ch = cpp_getc()) != '\'' && ch != EOF) {
				    if (ch == '\\')
					    ch = cpp_getc();
			    }
			    token = DELETED;
			    break;

		    case '\"':
			    /* skip to matching '\"' */
			    while ((ch = cpp_getc()) != '\"' && ch != EOF) {
				    if (ch == '\\')
					    ch = cpp_getc();
			    }
			    token = DELETED;
			    break;

		    case '(':
			    /* entering list */
			    if (listno)
				    listno++;

			    /* in block -- function call? */
			    if (blockno) {
				    token = ARGS;
				    break;
			    }
			    /* indirect declarator or parenthized expression */
			    else if ((ch = cpp_nonwhite()) == '*' || !gotname) {
				    cpp_ungetc(ch);
				    token = DELETED;
				    break;
			    }
			    /* function declarator with parameter list */
			    else if (ch != ')') {

				    /* read past parameter list */
				    for (lp = 1; lp && (ch = cpp_nonwhite()) != EOF;) {
					    ch == '(' && lp++ || ch == ')' && lp--;
				    }
			    }
			    /* read to end of declarator, i.e., past )...[](... */
			    while ((ch = cpp_nonwhite()) == ')' || ch == '[' || ch == '(')
				    switch (ch) {
					case '(':
						for (lp = 1; lp && (ch = cpp_nonwhite()) != EOF;) {
							ch == '(' && lp++ || ch == ')' && lp--;
						}
						break;
					case '[':
						for (lp = 1; lp && (ch = cpp_nonwhite()) != EOF;) {
							ch == '[' && lp++ || ch == ']' && lp--;
						}
						break;
				    }

			    /* type declarations following declarator */
			    if (ch != ',' && ch != ';' && ch != '{') {
				    /* read until ... ;{ *//*}}} */
				    for (oc = ch; ((ch = cpp_nonwhite()) != '{'
				    || oc != ';') && ch != EOF; oc = ch) ;
			    }
			    cpp_ungetc(ch);
			    token = ARGS;
			    break;

		    case ')':
			    /* expand ARGSEND to COMMA ARGSEND - allows
			     * proper handling of variable references at end
			     * of parameter lists */
			    if (expanded) {
				    /* leaving parameter list */
				    expanded = 0;
				    if (listno)
					    listno--;
				    token = ARGSEND;
			    } else {
				    expanded = 1;
				    cpp_ungetc(ch);
				    token = COMMA;
			    }
			    break;

		    case '[':
			    token = LBRACKET;
			    break;

		    case ']':
			    token = RBRACKET;
			    break;

		    case '{':
			    /* entering block */
			    blockno++;
			    token = BODY;
			    break;

		    case '}':
			    /* leaving block */
			    blockno--;
			    token = BODYEND;
			    break;

		    case EOF:
			    func_seen = 0;
			    lex_name[0] = '\0';
			    token = EOF;
			    break;

		    default:
			    /* is this the start of a name/keyword? */
			    if (isalpha(ch) || ch == '_') {
				    /* collect the whole word */
				    lex_name[0] = ch;
				    for (lp = 1; (isalnum(ch = cpp_getc())
				    || ch == '_') && lp < NAME_MAX - 1;) {
					    lex_name[lp++] = ch;
				    }
				    lex_name[lp] = '\0';

				    /* junk remainder of word */
				    while (isalnum(ch) || ch == '_') {
					    ch = cpp_getc();
				    }
				    cpp_ungetc(ch);

				    /* is it a reserved word? */
				    if (!strcmp(lex_name, "typedef")) {
					    token = KTYPEDEF;
				    } else if (!strcmp(lex_name, "static")) {
					    token = KSTATIC;
				    } else if (!strcmp(lex_name, "extern")) {
					    token = KEXTERN;
				    } else if (!strcmp(lex_name, "struct")
					    || !strcmp(lex_name, "union")
					  || !strcmp(lex_name, "enum")) {
					    token = KSTRUCT;
				    } else if (name_in_list(type_specifier)) {
					    token = TYPESPEC;
				    } else if (!name_in_list(keyword)) {
					    token = NAME;
				    } else {
					    token = DELETED;
				    }
			    }
			    /* structure reference operator */
			    else if (ch == '.') {
				    token = STRUREF;
			    }
			    /* indirect reference or assignment operator? */
			    else {
				    token = OPERATOR;
				    lp = cpp_getc();

				    /* assignment (esp., initializer) */
				    if (ch == '=' && lp != '=') {
					    token = ASSIGN;
					    cpp_ungetc(lp);
				    }
				    /* indirect reference */
				    else if (ch == '-' && lp == '>') {
					    token = STRUREF;
				    }
				    /* any other other operator or constant */
				    else {
					    cpp_ungetc(lp);
				    }
			    }

		}		/* end switch(ch) */

	} while (token == DELETED);

	return token;
}

/* -------------------------------------------------------------------------- */
/* This section handles preprocessor directives.  It strips out all of the
 * directives, and may emit a tag for #define directives.  */

static int cpp_afternl;		/* boolean: look for '#' character? */
static int cpp_prevch;		/* an ungotten character, if any */
static int cpp_refsok;		/* boolean: can we echo characters out to "refs"? */

/* This function opens the file & resets variables */
static cpp_open(char *name)
			/* name of source file to be opened */
{
	/* use the lower-level file_open function to open the file */
	if (file_open(name)) {
		/* reset variables */
		cpp_afternl = TRUE;
		cpp_refsok = TRUE;
		return 1;
	}
	return 0;
}

/* returns next nonwhite-space character */
static cpp_nonwhite(void)
{
	int ch;
	int next;

	while ((ch = cpp_getc()) != EOF && (isspace(ch) || ch == '/'))
		if (ch == '/')
			switch (ch = cpp_getc()) {
			    case '*':
				    ch = cpp_getc();
				    next = cpp_getc();
				    while (next != EOF && (ch != '*' || next != '/')) {
					    ch = next;
					    next = cpp_getc();
				    }
				    break;
			    case '/':
				    while ((ch = cpp_getc()) != '\n' && ch != EOF) ;
				    break;
			    default:
				    cpp_ungetc(ch);
				    return '/';
			}
	return ch;
}


/* This function returns the next character which isn't part of a directive */
static cpp_getc(void)
{
	int ch;			/* the next input character */
	int i = 0;

	/* if we have an ungotten character, then return it */
	if ((ch = cpp_prevch)) {
		cpp_prevch = 0;
		return ch;
	}
	/* Get a character from the file.  Return it if not special '#' */
	if ((ch = file_getc()) == '\n') {
		cpp_afternl = TRUE;
		return ch;
	} else if (ch != '#' || !cpp_afternl) {
		/* normal character.  Any non-whitespace should turn off
		 * afternl */
		if (ch != ' ' && ch != '\t') {
			cpp_afternl = FALSE;
		}
		return ch;
	}
	/* Yikes!  We found a directive */

	/* skip whitespace */
	while ((ch = file_getc()) == ' ' || ch == '\t') {
		;		/* do nothing */

	}

	/* # directive followed by a digit */
	if (isdigit(ch)) {
		/* assert: directive of the form: # nn "filename" */

		/* update line number */
		file_lnum = ch - '0';
		while (isdigit(ch = file_getc())) {
			file_lnum = file_lnum * 10 + ch - '0';
		}

		/* adjust line number for newline of directive */
		file_lnum--;

		/* skip to path name */
		while ((ch = file_getc()) != '\"' && ch != EOF) {
			;	/* do nothing */
		}

		/* collect whole path */
		while ((ch = file_getc()) != '\"' && ch != EOF && i < PATH_MAX - 1) {
			file_name[i++] = ch;
		}
		file_name[i] = '\0';
	}
	/* skip to the end of the directive -- a newline that isn't
	 * preceded by a '\' character.  */
	while (ch != '\n' && ch != EOF) {
		if (ch == '\\') {
			ch = file_getc();
		}
		ch = file_getc();
	}

	/* return the newline that we found at the end of the directive */
	return ch;
}


/* This puts a character back into the input queue for the source file */
static int cpp_ungetc(int ch)
			/* a character to be ungotten */
{
	return cpp_prevch = ch;
}


/* This function opens a file, and resets the line counter.  If it fails, it
 * it will display an error message and leave the file_fp set to NULL.  */
static int file_open(char *name)
				/* name of file to be opened */
{
	/* if another file was already open, then close it */
	if (file_fp) {
		fclose(file_fp);
	}
	/* cannot open file */
	if (!(file_fp = !strcmp(name, "-") ? stdin : fopen(name, "r"))) {
		perror(name);
		return 0;
	}
	/* reset the name & line number */
	strcpy(file_name, name);
	file_lnum = 0L;
	file_afternl = TRUE;
	return 1;
}

/* This function reads a single character from the stream.  If the
 * *previous* character was a newline, then it also increments
 * file_lnum and sets file_offset.  */
static int file_getc(void)
{
	int ch;

	/* if there is an ungotten character, then return it. */
	if (file_prevch) {
		ch = file_prevch;
		file_prevch = 0;
		return ch;
	}
	/* if previous character was a newline, then we're starting a line */
	if (file_afternl) {
		file_afternl = FALSE;
		file_lnum++;
	}
	/* Get a character.  If no file is open, then return EOF */
	ch = (file_fp ? getc(file_fp) : EOF);

	/* if it is a newline, then remember that fact */
	if (ch == '\n') {
		file_afternl = TRUE;
	}
	/* return the character */
	return ch;
}

/* This function ungets a character from the current source file */
static file_ungetc(int ch)
			/* character to be ungotten */
{
	return file_prevch = ch;
}


/* initialize per-file name lists */
static void per_file_init(void)
{
	char **p;

	for (p = type; *p; p++) {
		/* add type to type specifier list */
		name_to_list(&type_specifier, *p);
	}

	for (p = reserved; *p; p++) {
		name_to_list(&keyword, *p);
	}

	if (gnu_keywords) {
		for (p = gnu_reserved; *p; p++) {
			name_to_list(&keyword, *p);
		}
	}
	if (posix_keywords) {
		for (p = posix_reserved; *p; p++) {
			name_to_list(&keyword, *p);
		}
	}
	if (ansi_keywords) {
		for (p = ansi_reserved; *p; p++) {
			name_to_list(&keyword, *p);
		}
	}
}

/* free per-file name lists */
static void per_file_cleanup(void)
{
	free_list(&type_specifier);
	free_list(&keyword);
	free_list(&variable);
	free_list(&extern_var);
}

/* check lex_name for (potential) name space conflict */
static BOOLEAN name_redefined(int isvar)
{
	/* name redefined */
	if (name_in_list(func_defined) || name_in_list(type_specifier)
	    || name_in_list(extern_var) || name_in_list(variable)) {
		complain(isvar);
		return TRUE;
	}
	return FALSE;
}


static void display_list(const char *type, char **words)
{
	int i = 0;

	printf("\nList = %s\n", type);
	while(*words) {
		printf("-%20s", *words);
		i++;
		if(i == 3)
			i = 0;
		words++;
	}
}

static void show_all_lists(void)
{
	display_list("gnu", gnu_reserved);
	display_list("posix", posix_reserved);
	display_list("ansi", ansi_reserved);
	exit(1);
}


/* add lex_name to a list; return 0 on error */
static BOOLEAN name_to_list(name_t ** lp, char *lex_name)
{
	name_t *p;

	p = (name_t *) malloc(sizeof (name_t));
	if(!p)
		return FALSE;

	p->name = (char *) malloc(strlen(lex_name) + 1);
	if(!p->name)
		return FALSE;

	strcpy(p->name, lex_name);

	/* add structure to head of list */
	p->next = *lp;
	*lp = p;
	return 1;
}

/* remove lex_name from a list; lex_name must be on list --
 * Return TRUE for success, FALSE for a problem*/
static BOOLEAN name_from_list(name_t ** lp)
				/* list pointer */
{
	name_t *q, *p = *lp;

	if (strcmp((*lp)->name, lex_name) == 0) {
		*lp = (*lp)->next;
		free(p->name);
		free(p);
		return FALSE;
	} else {
		for (; p->next && strcmp(p->next->name, lex_name); p = p->next) ;
		
		assert(p->next);
		q = p->next;
		p->next = p->next->next;
		free(q->name);
		free(q);
		return FALSE; 
	}
	
	/* if this happens, haven't found name */
	return TRUE;
}


/* return TURE  if lex_name in list specified list, otherwise FALSE */
static BOOLEAN name_in_list(name_t * l)
{
	for (; l; l = l->next) {
		if (!strcmp(lex_name, l->name))
			return TRUE;
	}
	return FALSE;
}


/* free a list's memory */
static void free_list(name_t ** lp)
{
	name_t *l = *lp;
	name_t *t;

	for (; l; l = t) {
		t = l->next;
		free(l->name);
		free(l);
	}
	*lp = NULL;
}

static void complain(int isvar)
{
	fprintf(stderr, isvar ? "%s: cannot redefine: %s\t{v %s %ld}\n"
	     : "%s: cannot redefine: %s\t{%s %ld}\n", progname, lex_name,
		file_name, file_lnum);
}