cregit-Linux how code gets into the kernel

Release 4.15 scripts/unifdef.c

Directory: scripts
/*
 * Copyright (c) 2002 - 2011 Tony Finch <dot@dotat.at>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * unifdef - remove ifdef'ed lines
 *
 * This code was derived from software contributed to Berkeley by Dave Yost.
 * It was rewritten to support ANSI C by Tony Finch. The original version
 * of unifdef carried the 4-clause BSD copyright licence. None of its code
 * remains in this version (though some of the names remain) so it now
 * carries a more liberal licence.
 *
 *  Wishlist:
 *      provide an option which will append the name of the
 *        appropriate symbol after #else's and #endif's
 *      provide an option which will check symbols after
 *        #else's and #endif's to see that they match their
 *        corresponding #ifdef or #ifndef
 *
 *   These require better buffer handling, which would also make
 *   it possible to handle all "dodgy" directives correctly.
 */

#include <sys/types.h>
#include <sys/stat.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>


const char copyright[] =
    "@(#) $Version: unifdef-2.5 $\n"
    "@(#) $Author: Tony Finch (dot@dotat.at) $\n"
    "@(#) $URL: http://dotat.at/prog/unifdef $\n"
;

/* types of input lines: */
typedef enum {
	
LT_TRUEI,		/* a true #if with ignore flag */
	
LT_FALSEI,		/* a false #if with ignore flag */
	
LT_IF,			/* an unknown #if */
	
LT_TRUE,		/* a true #if */
	
LT_FALSE,		/* a false #if */
	
LT_ELIF,		/* an unknown #elif */
	
LT_ELTRUE,		/* a true #elif */
	
LT_ELFALSE,		/* a false #elif */
	
LT_ELSE,		/* #else */
	
LT_ENDIF,		/* #endif */
	
LT_DODGY,		/* flag: directive is not on one line */
	
LT_DODGY_LAST = LT_DODGY + LT_ENDIF,
	
LT_PLAIN,		/* ordinary line */
	
LT_EOF,			/* end of file */
	
LT_ERROR,		/* unevaluable #if */
	
LT_COUNT

} Linetype;


static char const * const linetype_name[] = {
	"TRUEI", "FALSEI", "IF", "TRUE", "FALSE",
	"ELIF", "ELTRUE", "ELFALSE", "ELSE", "ENDIF",
	"DODGY TRUEI", "DODGY FALSEI",
	"DODGY IF", "DODGY TRUE", "DODGY FALSE",
	"DODGY ELIF", "DODGY ELTRUE", "DODGY ELFALSE",
	"DODGY ELSE", "DODGY ENDIF",
	"PLAIN", "EOF", "ERROR"
};

/* state of #if processing */
typedef enum {
	
IS_OUTSIDE,
	
IS_FALSE_PREFIX,	/* false #if followed by false #elifs */
	
IS_TRUE_PREFIX,		/* first non-false #(el)if is true */
	
IS_PASS_MIDDLE,		/* first non-false #(el)if is unknown */
	
IS_FALSE_MIDDLE,	/* a false #elif after a pass state */
	
IS_TRUE_MIDDLE,		/* a true #elif after a pass state */
	
IS_PASS_ELSE,		/* an else after a pass state */
	
IS_FALSE_ELSE,		/* an else after a true state */
	
IS_TRUE_ELSE,		/* an else after only false states */
	
IS_FALSE_TRAILER,	/* #elifs after a true are false */
	
IS_COUNT

} Ifstate;


static char const * const ifstate_name[] = {
	"OUTSIDE", "FALSE_PREFIX", "TRUE_PREFIX",
	"PASS_MIDDLE", "FALSE_MIDDLE", "TRUE_MIDDLE",
	"PASS_ELSE", "FALSE_ELSE", "TRUE_ELSE",
	"FALSE_TRAILER"
};

/* state of comment parser */
typedef enum {
	
NO_COMMENT = false,	/* outside a comment */
	
C_COMMENT,		/* in a comment like this one */
	
CXX_COMMENT,		/* between // and end of line */
	
STARTING_COMMENT,	/* just after slash-backslash-newline */
	
FINISHING_COMMENT,	/* star-backslash-newline in a C comment */
	
CHAR_LITERAL,		/* inside '' */
	
STRING_LITERAL		/* inside "" */

} Comment_state;


static char const * const comment_name[] = {
	"NO", "C", "CXX", "STARTING", "FINISHING", "CHAR", "STRING"
};

/* state of preprocessor line parser */
typedef enum {
	
LS_START,		/* only space and comments on this line */
	
LS_HASH,		/* only space, comments, and a hash */
	
LS_DIRTY		/* this line can't be a preprocessor line */

} Line_state;


static char const * const linestate_name[] = {
	"START", "HASH", "DIRTY"
};

/*
 * Minimum translation limits from ISO/IEC 9899:1999 5.2.4.1
 */

#define	MAXDEPTH        64			
/* maximum #if nesting */

#define	MAXLINE         4096			
/* maximum length of line */

#define	MAXSYMS         4096			
/* maximum number of symbols */

/*
 * Sometimes when editing a keyword the replacement text is longer, so
 * we leave some space at the end of the tline buffer to accommodate this.
 */

#define	EDITSLOP        10

/*
 * For temporary filenames
 */

#define TEMPLATE        "unifdef.XXXXXX"

/*
 * Globals.
 */


static bool             compblank;		
/* -B: compress blank lines */

static bool             lnblank;		
/* -b: blank deleted lines */

static bool             complement;		
/* -c: do the complement */

static bool             debugging;		
/* -d: debugging reports */

static bool             iocccok;		
/* -e: fewer IOCCC errors */

static bool             strictlogic;		
/* -K: keep ambiguous #ifs */

static bool             killconsts;		
/* -k: eval constant #ifs */

static bool             lnnum;			
/* -n: add #line directives */

static bool             symlist;		
/* -s: output symbol list */

static bool             symdepth;		
/* -S: output symbol depth */

static bool             text;			
/* -t: this is a text file */


static const char      *symname[MAXSYMS];	
/* symbol name */

static const char      *value[MAXSYMS];		
/* -Dsym=value */

static bool             ignore[MAXSYMS];	
/* -iDsym or -iUsym */

static int              nsyms;			
/* number of symbols */


static FILE            *input;			
/* input file pointer */

static const char      *filename;		
/* input file name */

static int              linenum;		
/* current line number */

static FILE            *output;			
/* output file pointer */

static const char      *ofilename;		
/* output file name */

static bool             overwriting;		
/* output overwrites input */

static char             tempname[FILENAME_MAX];	
/* used when overwriting */


static char             tline[MAXLINE+EDITSLOP];
/* input buffer plus space */

static char            *keyword;		
/* used for editing #elif's */


static const char      *newline;		
/* input file format */

static const char       newline_unix[] = "\n";

static const char       newline_crlf[] = "\r\n";


static Comment_state    incomment;		
/* comment parser state */

static Line_state       linestate;		
/* #if line parser state */

static Ifstate          ifstate[MAXDEPTH];	
/* #if processor state */

static bool             ignoring[MAXDEPTH];	
/* ignore comments state */

static int              stifline[MAXDEPTH];	
/* start of current #if */

static int              depth;			
/* current #if nesting */

static int              delcount;		
/* count of deleted lines */

static unsigned         blankcount;		
/* count of blank lines */

static unsigned         blankmax;		
/* maximum recent blankcount */

static bool             constexpr;		
/* constant #if expression */

static bool             zerosyms = true;	
/* to format symdepth output */

static bool             firstsym;		
/* ditto */


static int              exitstat;		
/* program exit status */

static void             addsym(bool, bool, char *);
static void             closeout(void);
static void             debug(const char *, ...);
static void             done(void);
static void             error(const char *);
static int              findsym(const char *);
static void             flushline(bool);
static Linetype         parseline(void);
static Linetype         ifeval(const char **);
static void             ignoreoff(void);
static void             ignoreon(void);
static void             keywordedit(const char *);
static void             nest(void);
static void             process(void);
static const char      *skipargs(const char *);
static const char      *skipcomment(const char *);
static const char      *skipsym(const char *);
static void             state(Ifstate);
static int              strlcmp(const char *, const char *, size_t);
static void             unnest(void);
static void             usage(void);
static void             version(void);


#define endsym(c) (!isalnum((unsigned char)c) && c != '_')

/*
 * The main program.
 */

int main(int argc, char *argv[]) { int opt; while ((opt = getopt(argc, argv, "i:D:U:I:o:bBcdeKklnsStV")) != -1) switch (opt) { case 'i': /* treat stuff controlled by these symbols as text */ /* * For strict backwards-compatibility the U or D * should be immediately after the -i but it doesn't * matter much if we relax that requirement. */ opt = *optarg++; if (opt == 'D') addsym(true, true, optarg); else if (opt == 'U') addsym(true, false, optarg); else usage(); break; case 'D': /* define a symbol */ addsym(false, true, optarg); break; case 'U': /* undef a symbol */ addsym(false, false, optarg); break; case 'I': /* no-op for compatibility with cpp */ break; case 'b': /* blank deleted lines instead of omitting them */ case 'l': /* backwards compatibility */ lnblank = true; break; case 'B': /* compress blank lines around removed section */ compblank = true; break; case 'c': /* treat -D as -U and vice versa */ complement = true; break; case 'd': debugging = true; break; case 'e': /* fewer errors from dodgy lines */ iocccok = true; break; case 'K': /* keep ambiguous #ifs */ strictlogic = true; break; case 'k': /* process constant #ifs */ killconsts = true; break; case 'n': /* add #line directive after deleted lines */ lnnum = true; break; case 'o': /* output to a file */ ofilename = optarg; break; case 's': /* only output list of symbols that control #ifs */ symlist = true; break; case 'S': /* list symbols with their nesting depth */ symlist = symdepth = true; break; case 't': /* don't parse C comments */ text = true; break; case 'V': /* print version */ version(); default: usage(); } argc -= optind; argv += optind; if (compblank && lnblank) errx(2, "-B and -b are mutually exclusive"); if (argc > 1) { errx(2, "can only do one file"); } else if (argc == 1 && strcmp(*argv, "-") != 0) { filename = *argv; input = fopen(filename, "rb"); if (input == NULL) err(2, "can't open %s", filename); } else { filename = "[stdin]"; input = stdin; } if (ofilename == NULL) { ofilename = "[stdout]"; output = stdout; } else { struct stat ist, ost; if (stat(ofilename, &ost) == 0 && fstat(fileno(input), &ist) == 0) overwriting = (ist.st_dev == ost.st_dev && ist.st_ino == ost.st_ino); if (overwriting) { const char *dirsep; int ofd; dirsep = strrchr(ofilename, '/'); if (dirsep != NULL) snprintf(tempname, sizeof(tempname), "%.*s/" TEMPLATE, (int)(dirsep - ofilename), ofilename); else snprintf(tempname, sizeof(tempname), TEMPLATE); ofd = mkstemp(tempname); if (ofd != -1) output = fdopen(ofd, "wb+"); if (output == NULL) err(2, "can't create temporary file"); fchmod(ofd, ist.st_mode & (S_IRWXU|S_IRWXG|S_IRWXO)); } else { output = fopen(ofilename, "wb"); if (output == NULL) err(2, "can't open %s", ofilename); } } process(); abort(); /* bug */ }

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Tony Finch33559.61%266.67%
Sam Ravnborg22740.39%133.33%
Total562100.00%3100.00%


static void version(void) { const char *c = copyright; for (;;) { while (*++c != '$') if (*c == '\0') exit(0); while (*++c != '$') putc(*c, stderr); putc('\n', stderr); } }

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Tony Finch5280.00%150.00%
Sam Ravnborg1320.00%150.00%
Total65100.00%2100.00%


static void usage(void) { fprintf(stderr, "usage: unifdef [-bBcdeKknsStV] [-Ipath]" " [-Dsym[=val]] [-Usym] [-iDsym[=val]] [-iUsym] ... [file]\n"); exit(2); }

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Sam Ravnborg2095.24%150.00%
Tony Finch14.76%150.00%
Total21100.00%2100.00%

/* * A state transition function alters the global #if processing state * in a particular way. The table below is indexed by the current * processing state and the type of the current line. * * Nesting is handled by keeping a stack of states; some transition * functions increase or decrease the depth. They also maintain the * ignore state on a stack. In some complicated cases they have to * alter the preprocessor directive, as follows. * * When we have processed a group that starts off with a known-false * #if/#elif sequence (which has therefore been deleted) followed by a * #elif that we don't understand and therefore must keep, we edit the * latter into a #if to keep the nesting correct. We use strncpy() to * overwrite the 4 byte token "elif" with "if " without a '\0' byte. * * When we find a true #elif in a group, the following block will * always be kept and the rest of the sequence after the next #elif or * #else will be discarded. We edit the #elif into a #else and the * following directive to #endif since this has the desired behaviour. * * "Dodgy" directives are split across multiple lines, the most common * example being a multi-line comment hanging off the right of the * directive. We can handle them correctly only if there is no change * from printing to dropping (or vice versa) caused by that directive. * If the directive is the first of a group we have a choice between * failing with an error, or passing it through unchanged instead of * evaluating it. The latter is not the default to avoid questions from * users about unifdef unexpectedly leaving behind preprocessor directives. */ typedef void state_fn(void); /* report an error */
static void Eelif (void) { error("Inappropriate #elif"); }

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Sam Ravnborg13100.00%1100.00%
Total13100.00%1100.00%


static void Eelse (void) { error("Inappropriate #else"); }

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Sam Ravnborg13100.00%1100.00%
Total13100.00%1100.00%


static void Eendif(void) { error("Inappropriate #endif"); }

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Total13100.00%1100.00%


static void Eeof (void) { error("Premature EOF"); }

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Sam Ravnborg13100.00%1100.00%
Total13100.00%1100.00%


static void Eioccc(void) { error("Obfuscated preprocessor control line"); }

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Sam Ravnborg13100.00%1100.00%
Total13100.00%1100.00%

/* plain line handling */
static void print (void) { flushline(true); }

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static void drop (void) { flushline(false); }

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/* output lacks group's start line */
static void Strue (void) { drop(); ignoreoff(); state(IS_TRUE_PREFIX); }

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Sam Ravnborg19100.00%1100.00%
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static void Sfalse(void) { drop(); ignoreoff(); state(IS_FALSE_PREFIX); }

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static void Selse (void) { drop(); state(IS_TRUE_ELSE); }

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Sam Ravnborg16100.00%1100.00%
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/* print/pass this block */
static void Pelif (void) { print(); ignoreoff(); state(IS_PASS_MIDDLE); }

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static void Pelse (void) { print(); state(IS_PASS_ELSE); }

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Sam Ravnborg16100.00%1100.00%
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static void Pendif(void) { print(); unnest(); }

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Sam Ravnborg14100.00%1100.00%
Total14100.00%1100.00%

/* discard this block */
static void Dfalse(void) { drop(); ignoreoff(); state(IS_FALSE_TRAILER); }

Contributors

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static void Delif (void) { drop(); ignoreoff(); state(IS_FALSE_MIDDLE); }

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static void Delse (void) { drop(); state(IS_FALSE_ELSE); }

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static void Dendif(void) { drop(); unnest(); }

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/* first line of group */
static void Fdrop (void) { nest(); Dfalse(); }

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static void Fpass (void) { nest(); Pelif(); }

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static void Ftrue (void) { nest(); Strue(); }

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static void Ffalse(void) { nest(); Sfalse(); }

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/* variable pedantry for obfuscated lines */
static void Oiffy (void) { if (!iocccok) Eioccc(); Fpass(); ignoreon(); }

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Sam Ravnborg22100.00%1100.00%
Total22100.00%1100.00%


static void Oif (void) { if (!iocccok) Eioccc(); Fpass(); }

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Sam Ravnborg19100.00%1100.00%
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static void Oelif (void) { if (!iocccok) Eioccc(); Pelif(); }

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Sam Ravnborg19100.00%1100.00%
Total19100.00%1100.00%

/* ignore comments in this block */
static void Idrop (void) { Fdrop(); ignoreon(); }

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static void Itrue (void) { Ftrue(); ignoreon(); }

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static void Ifalse(void) { Ffalse(); ignoreon(); }

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/* modify this line */
static void Mpass (void) { strncpy(keyword, "if ", 4); Pelif(); }

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Sam Ravnborg20100.00%1100.00%
Total20100.00%1100.00%


static void Mtrue (void) { keywordedit("else"); state(IS_TRUE_MIDDLE); }

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Sam Ravnborg1794.44%150.00%
Tony Finch15.56%150.00%
Total18100.00%2100.00%


static void Melif (void) { keywordedit("endif"); state(IS_FALSE_TRAILER); }

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Sam Ravnborg1794.44%150.00%
Tony Finch15.56%150.00%
Total18100.00%2100.00%


static void Melse (void) { keywordedit("endif"); state(IS_FALSE_ELSE); }

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Sam Ravnborg1794.44%150.00%
Tony Finch15.56%150.00%
Total18100.00%2100.00%

static state_fn * const trans_table[IS_COUNT][LT_COUNT] = { /* IS_OUTSIDE */ { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Eendif, Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Eendif, print, done, abort }, /* IS_FALSE_PREFIX */ { Idrop, Idrop, Fdrop, Fdrop, Fdrop, Mpass, Strue, Sfalse,Selse, Dendif, Idrop, Idrop, Fdrop, Fdrop, Fdrop, Mpass, Eioccc,Eioccc,Eioccc,Eioccc, drop, Eeof, abort }, /* IS_TRUE_PREFIX */ { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Dfalse,Dfalse,Dfalse,Delse, Dendif, Oiffy, Oiffy, Fpass, Oif, Oif, Eioccc,Eioccc,Eioccc,Eioccc,Eioccc, print, Eeof, abort }, /* IS_PASS_MIDDLE */ { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Pelif, Mtrue, Delif, Pelse, Pendif, Oiffy, Oiffy, Fpass, Oif, Oif, Pelif, Oelif, Oelif, Pelse, Pendif, print, Eeof, abort }, /* IS_FALSE_MIDDLE */ { Idrop, Idrop, Fdrop, Fdrop, Fdrop, Pelif, Mtrue, Delif, Pelse, Pendif, Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eioccc,Eioccc,Eioccc,Eioccc,Eioccc, drop, Eeof, abort }, /* IS_TRUE_MIDDLE */ { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Melif, Melif, Melif, Melse, Pendif, Oiffy, Oiffy, Fpass, Oif, Oif, Eioccc,Eioccc,Eioccc,Eioccc,Pendif, print, Eeof, abort }, /* IS_PASS_ELSE */ { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Pendif, Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Pendif, print, Eeof, abort }, /* IS_FALSE_ELSE */ { Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eelif, Eelif, Eelif, Eelse, Dendif, Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eelif, Eelif, Eelif, Eelse, Eioccc, drop, Eeof, abort }, /* IS_TRUE_ELSE */ { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Dendif, Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Eioccc, print, Eeof, abort }, /* IS_FALSE_TRAILER */ { Idrop, Idrop, Fdrop, Fdrop, Fdrop, Dfalse,Dfalse,Dfalse,Delse, Dendif, Idrop, Idrop, Fdrop, Fdrop, Fdrop, Dfalse,Dfalse,Dfalse,Delse, Eioccc, drop, Eeof, abort } /*TRUEI FALSEI IF TRUE FALSE ELIF ELTRUE ELFALSE ELSE ENDIF TRUEI FALSEI IF TRUE FALSE ELIF ELTRUE ELFALSE ELSE ENDIF (DODGY) PLAIN EOF ERROR */ }; /* * State machine utility functions */
static void ignoreoff(void) { if (depth == 0) abort(); /* bug */ ignoring[depth] = ignoring[depth-1]; }

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static void ignoreon(void) { ignoring[depth] = true; }

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static void keywordedit(const char *replacement) { snprintf(keyword, tline + sizeof(tline) - keyword, "%s%s", replacement, newline); print(); }

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Sam Ravnborg2470.59%266.67%
Tony Finch1029.41%133.33%
Total34100.00%3100.00%


static void nest(void) { if (depth > MAXDEPTH-1) abort(); /* bug */ if (depth == MAXDEPTH-1) error("Too many levels of nesting"); depth += 1; stifline[depth] = linenum; }

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Sam Ravnborg2863.64%150.00%
Tony Finch1636.36%150.00%
Total44100.00%2100.00%


static void unnest(void) { if (depth == 0) abort(); /* bug */ depth -= 1; }

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static void state(Ifstate is) { ifstate[depth] = is; }

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Total16100.00%1100.00%

/* * Write a line to the output or not, according to command line options. */
static void flushline(bool keep) { if (symlist) return; if (keep ^ complement) { bool blankline = tline[strspn(tline, " \t\r\n")] == '\0'; if (blankline && compblank && blankcount != blankmax) { delcount += 1; blankcount += 1; } else { if (lnnum && delcount > 0) printf("#line %d%s", linenum, newline); fputs(tline, output); delcount = 0; blankmax = blankcount = blankline ? blankcount + 1 : 0; } } else { if (lnblank) fputs(newline, output); exitstat = 1; delcount += 1; blankcount = 0; } if (debugging) fflush(output); }

Contributors

PersonTokensPropCommitsCommitProp
Tony Finch7051.85%266.67%
Sam Ravnborg6548.15%133.33%
Total135100.00%3100.00%

/* * The driver for the state machine. */
static void process(void) { /* When compressing blank lines, act as if the file is preceded by a large number of blank lines. */ blankmax = blankcount = 1000; for (;;) { Linetype lineval = parseline(); trans_table[ifstate[depth]][lineval](); debug("process line %d %s -> %s depth %d", linenum, linetype_name[lineval], ifstate_name[ifstate[depth]], depth); } }

Contributors

PersonTokensPropCommitsCommitProp
Tony Finch5079.37%266.67%
Sam Ravnborg1320.63%133.33%
Total63100.00%3100.00%

/* * Flush the output and handle errors. */
static void closeout(void) { if (symdepth && !zerosyms) printf("\n"); if (fclose(output) == EOF) { warn("couldn't write to %s", ofilename); if (overwriting) { unlink(tempname); errx(