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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	bin/ksh/history.c	Lines:	272	410	66.3 %
Date:	2017-11-07	Branches:	172	330	52.1 %


/*	$OpenBSD: history.c,v 1.71 2017/09/07 19:08:32 jca Exp $	*/

/*
 * command history
 */

/*
 *	This file contains
 *	a)	the original in-memory history  mechanism
 *	b)	a more complicated mechanism done by  pc@hillside.co.uk
 *		that more closely follows the real ksh way of doing
 *		things.
 */

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

#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <vis.h>

#include "sh.h"

#ifdef HISTORY

static void	history_write(void);
static FILE	*history_open(void);
static int	history_load(Source *);
static void	history_close(void);

static int	hist_execute(char *);
static int	hist_replace(char **, const char *, const char *, int);
static char   **hist_get(const char *, int, int);
static char   **hist_get_oldest(void);
static void	histbackup(void);

static FILE	*histfh;
static char   **histbase;	/* actual start of the history[] allocation */
static char   **current;	/* current position in history[] */
static char    *hname;		/* current name of history file */
static int	hstarted;	/* set after hist_init() called */
static int	ignoredups;	/* ditch duplicated history lines? */
static int	ignorespace;	/* ditch lines starting with a space? */
static Source	*hist_source;
static uint32_t	line_co;

static struct stat last_sb;

int
c_fc(char **wp)
{
	struct shf *shf;
	struct temp *tf = NULL;
	char *p, *editor = NULL;
	int gflag = 0, lflag = 0, nflag = 0, sflag = 0, rflag = 0;
	int optc, ret;
	char *first = NULL, *last = NULL;
	char **hfirst, **hlast, **hp;
	static int depth;

	if (depth != 0) {
		bi_errorf("history function called recursively");
		return 1;
	}

	if (!Flag(FTALKING_I)) {
		bi_errorf("history functions not available");
		return 1;
	}

	while ((optc = ksh_getopt(wp, &builtin_opt,
	    "e:glnrs0,1,2,3,4,5,6,7,8,9,")) != -1)
		switch (optc) {
		case 'e':
			p = builtin_opt.optarg;
			if (strcmp(p, "-") == 0)
				sflag++;
			else {
				size_t len = strlen(p) + 4;
				editor = str_nsave(p, len, ATEMP);
				strlcat(editor, " $_", len);
			}
			break;
		case 'g': /* non-at&t ksh */
			gflag++;
			break;
		case 'l':
			lflag++;
			break;
		case 'n':
			nflag++;
			break;
		case 'r':
			rflag++;
			break;
		case 's':	/* posix version of -e - */
			sflag++;
			break;
		  /* kludge city - accept -num as -- -num (kind of) */
		case '0': case '1': case '2': case '3': case '4':
		case '5': case '6': case '7': case '8': case '9':
			p = shf_smprintf("-%c%s",
					optc, builtin_opt.optarg);
			if (!first)
				first = p;
			else if (!last)
				last = p;
			else {
				bi_errorf("too many arguments");
				return 1;
			}
			break;
		case '?':
			return 1;
		}
	wp += builtin_opt.optind;

	/* Substitute and execute command */
	if (sflag) {
		char *pat = NULL, *rep = NULL;

		if (editor || lflag || nflag || rflag) {
			bi_errorf("can't use -e, -l, -n, -r with -s (-e -)");
			return 1;
		}

		/* Check for pattern replacement argument */
		if (*wp && **wp && (p = strchr(*wp + 1, '='))) {
			pat = str_save(*wp, ATEMP);
			p = pat + (p - *wp);
			*p++ = '\0';
			rep = p;
			wp++;
		}
		/* Check for search prefix */
		if (!first && (first = *wp))
			wp++;
		if (last || *wp) {
			bi_errorf("too many arguments");
			return 1;
		}

		hp = first ? hist_get(first, false, false) :
		    hist_get_newest(false);
		if (!hp)
			return 1;
		depth++;
		ret = hist_replace(hp, pat, rep, gflag);
		depth--;
		return ret;
	}

	if (editor && (lflag || nflag)) {
		bi_errorf("can't use -l, -n with -e");
		return 1;
	}

	if (!first && (first = *wp))
		wp++;
	if (!last && (last = *wp))
		wp++;
	if (*wp) {
		bi_errorf("too many arguments");
		return 1;
	}
	if (!first) {
		hfirst = lflag ? hist_get("-16", true, true) :
		    hist_get_newest(false);
		if (!hfirst)
			return 1;
		/* can't fail if hfirst didn't fail */
		hlast = hist_get_newest(false);
	} else {
		/* POSIX says not an error if first/last out of bounds
		 * when range is specified; at&t ksh and pdksh allow out of
		 * bounds for -l as well.
		 */
		hfirst = hist_get(first, (lflag || last) ? true : false,
		    lflag ? true : false);
		if (!hfirst)
			return 1;
		hlast = last ? hist_get(last, true, lflag ? true : false) :
		    (lflag ? hist_get_newest(false) : hfirst);
		if (!hlast)
			return 1;
	}
	if (hfirst > hlast) {
		char **temp;

		temp = hfirst; hfirst = hlast; hlast = temp;
		rflag = !rflag; /* POSIX */
	}

	/* List history */
	if (lflag) {
		char *s, *t;
		const char *nfmt = nflag ? "\t" : "%d\t";

		for (hp = rflag ? hlast : hfirst;
		    hp >= hfirst && hp <= hlast; hp += rflag ? -1 : 1) {
			shf_fprintf(shl_stdout, nfmt,
			    hist_source->line - (int) (histptr - hp));
			/* print multi-line commands correctly */
			for (s = *hp; (t = strchr(s, '\n')); s = t)
				shf_fprintf(shl_stdout, "%.*s\t", ++t - s, s);
			shf_fprintf(shl_stdout, "%s\n", s);
		}
		shf_flush(shl_stdout);
		return 0;
	}

	/* Run editor on selected lines, then run resulting commands */

	tf = maketemp(ATEMP, TT_HIST_EDIT, &genv->temps);
	if (!(shf = tf->shf)) {
		bi_errorf("cannot create temp file %s - %s",
		    tf->name, strerror(errno));
		return 1;
	}
	for (hp = rflag ? hlast : hfirst;
	    hp >= hfirst && hp <= hlast; hp += rflag ? -1 : 1)
		shf_fprintf(shf, "%s\n", *hp);
	if (shf_close(shf) == EOF) {
		bi_errorf("error writing temporary file - %s", strerror(errno));
		return 1;
	}

	/* Ignore setstr errors here (arbitrary) */
	setstr(local("_", false), tf->name, KSH_RETURN_ERROR);

	/* XXX: source should not get trashed by this.. */
	{
		Source *sold = source;

		ret = command(editor ? editor : "${FCEDIT:-/bin/ed} $_", 0);
		source = sold;
		if (ret)
			return ret;
	}

	{
		struct stat statb;
		XString xs;
		char *xp;
		int n;

		if (!(shf = shf_open(tf->name, O_RDONLY, 0, 0))) {
			bi_errorf("cannot open temp file %s", tf->name);
			return 1;
		}

		n = fstat(shf->fd, &statb) < 0 ? 128 :
		    statb.st_size + 1;
		Xinit(xs, xp, n, hist_source->areap);
		while ((n = shf_read(xp, Xnleft(xs, xp), shf)) > 0) {
			xp += n;
			if (Xnleft(xs, xp) <= 0)
				XcheckN(xs, xp, Xlength(xs, xp));
		}
		if (n < 0) {
			bi_errorf("error reading temp file %s - %s",
			    tf->name, strerror(shf->errno_));
			shf_close(shf);
			return 1;
		}
		shf_close(shf);
		*xp = '\0';
		strip_nuls(Xstring(xs, xp), Xlength(xs, xp));
		depth++;
		ret = hist_execute(Xstring(xs, xp));
		depth--;
		return ret;
	}
}

/* Save cmd in history, execute cmd (cmd gets trashed) */
static int
hist_execute(char *cmd)
{
	Source *sold;
	int ret;
	char *p, *q;

	histbackup();

	for (p = cmd; p; p = q) {
		if ((q = strchr(p, '\n'))) {
			*q++ = '\0'; /* kill the newline */
			if (!*q) /* ignore trailing newline */
				q = NULL;
		}
		histsave(++(hist_source->line), p, 1);

		shellf("%s\n", p); /* POSIX doesn't say this is done... */
		if ((p = q)) /* restore \n (trailing \n not restored) */
			q[-1] = '\n';
	}

	/* Commands are executed here instead of pushing them onto the
	 * input 'cause posix says the redirection and variable assignments
	 * in
	 *	X=y fc -e - 42 2> /dev/null
	 * are to effect the repeated commands environment.
	 */
	/* XXX: source should not get trashed by this.. */
	sold = source;
	ret = command(cmd, 0);
	source = sold;
	return ret;
}

static int
hist_replace(char **hp, const char *pat, const char *rep, int global)
{
	char *line;

	if (!pat)
		line = str_save(*hp, ATEMP);
	else {
		char *s, *s1;
		int pat_len = strlen(pat);
		int rep_len = strlen(rep);
		int len;
		XString xs;
		char *xp;
		int any_subst = 0;

		Xinit(xs, xp, 128, ATEMP);
		for (s = *hp; (s1 = strstr(s, pat)) && (!any_subst || global);
		    s = s1 + pat_len) {
			any_subst = 1;
			len = s1 - s;
			XcheckN(xs, xp, len + rep_len);
			memcpy(xp, s, len);		/* first part */
			xp += len;
			memcpy(xp, rep, rep_len);	/* replacement */
			xp += rep_len;
		}
		if (!any_subst) {
			bi_errorf("substitution failed");
			return 1;
		}
		len = strlen(s) + 1;
		XcheckN(xs, xp, len);
		memcpy(xp, s, len);
		xp += len;
		line = Xclose(xs, xp);
	}
	return hist_execute(line);
}

/*
 * get pointer to history given pattern
 * pattern is a number or string
 */
static char **
hist_get(const char *str, int approx, int allow_cur)
{
	char **hp = NULL;
	int n;

	if (getn(str, &n)) {
		hp = histptr + (n < 0 ? n : (n - hist_source->line));
		if ((long)hp < (long)history) {
			if (approx)
				hp = hist_get_oldest();
			else {
				bi_errorf("%s: not in history", str);
				hp = NULL;
			}
		} else if (hp > histptr) {
			if (approx)
				hp = hist_get_newest(allow_cur);
			else {
				bi_errorf("%s: not in history", str);
				hp = NULL;
			}
		} else if (!allow_cur && hp == histptr) {
			bi_errorf("%s: invalid range", str);
			hp = NULL;
		}
	} else {
		int anchored = *str == '?' ? (++str, 0) : 1;

		/* the -1 is to avoid the current fc command */
		n = findhist(histptr - history - 1, 0, str, anchored);
		if (n < 0) {
			bi_errorf("%s: not in history", str);
			hp = NULL;
		} else
			hp = &history[n];
	}
	return hp;
}

/* Return a pointer to the newest command in the history */
char **
hist_get_newest(int allow_cur)
{
	if (histptr < history || (!allow_cur && histptr == history)) {
		bi_errorf("no history (yet)");
		return NULL;
	}
	if (allow_cur)
		return histptr;
	return histptr - 1;
}

/* Return a pointer to the oldest command in the history */
static char **
hist_get_oldest(void)
{
	if (histptr <= history) {
		bi_errorf("no history (yet)");
		return NULL;
	}
	return history;
}

/******************************/
/* Back up over last histsave */
/******************************/
static void
histbackup(void)
{
	static int last_line = -1;

	if (histptr >= history && last_line != hist_source->line) {
		hist_source->line--;
		afree(*histptr, APERM);
		histptr--;
		last_line = hist_source->line;
	}
}

static void
histreset(void)
{
	char **hp;

	for (hp = history; hp <= histptr; hp++)
		afree(*hp, APERM);

	histptr = history - 1;
	hist_source->line = 0;
}

/*
 * Return the current position.
 */
char **
histpos(void)
{
	return current;
}

int
histnum(int n)
{
	int	last = histptr - history;

	if (n < 0 || n >= last) {
		current = histptr;
		return last;
	} else {
		current = &history[n];
		return n;
	}
}

/*
 * This will become unnecessary if hist_get is modified to allow
 * searching from positions other than the end, and in either
 * direction.
 */
int
findhist(int start, int fwd, const char *str, int anchored)
{
	char	**hp;
	int	maxhist = histptr - history;
	int	incr = fwd ? 1 : -1;
	int	len = strlen(str);

	if (start < 0 || start >= maxhist)
		start = maxhist;

	hp = &history[start];
	for (; hp >= history && hp <= histptr; hp += incr)
		if ((anchored && strncmp(*hp, str, len) == 0) ||
		    (!anchored && strstr(*hp, str)))
			return hp - history;

	return -1;
}

int
findhistrel(const char *str)
{
	int	maxhist = histptr - history;
	int	start = maxhist - 1;
	int	rec = atoi(str);

	if (rec == 0)
		return -1;
	if (rec > 0) {
		if (rec > maxhist)
			return -1;
		return rec - 1;
	}
	if (rec > maxhist)
		return -1;
	return start + rec + 1;
}

void
sethistcontrol(const char *str)
{
	char *spec, *tok, *state;

	ignorespace = 0;
	ignoredups = 0;

	if (str == NULL)
		return;

	spec = str_save(str, ATEMP);
	for (tok = strtok_r(spec, ":", &state); tok != NULL;
	     tok = strtok_r(NULL, ":", &state)) {
		if (strcmp(tok, "ignoredups") == 0)
			ignoredups = 1;
		else if (strcmp(tok, "ignorespace") == 0)
			ignorespace = 1;
	}
	afree(spec, ATEMP);
}

/*
 *	set history
 *	this means reallocating the dataspace
 */
void
sethistsize(int n)
{
	if (n > 0 && n != histsize) {
		int offset = histptr - history;

		/* save most recent history */
		if (offset > n - 1) {
			char **hp;

			offset = n - 1;
			for (hp = history; hp < histptr - offset; hp++)
				afree(*hp, APERM);
			memmove(history, histptr - offset, n * sizeof(char *));
		}

		histsize = n;
		histbase = areallocarray(histbase, n + 1, sizeof(char *), APERM);
		history = histbase + 1;
		histptr = history + offset;
	}
}

/*
 *	set history file
 *	This can mean reloading/resetting/starting history file
 *	maintenance
 */
void
sethistfile(const char *name)
{
	/* if not started then nothing to do */
	if (hstarted == 0)
		return;

	/* if the name is the same as the name we have */
	if (hname && strcmp(hname, name) == 0)
		return;
	/*
	 * its a new name - possibly
	 */
	if (hname) {
		afree(hname, APERM);
		hname = NULL;
		histreset();
	}

	history_close();
	hist_init(hist_source);
}

/*
 *	initialise the history vector
 */
void
init_histvec(void)
{
	if (histbase == NULL) {
		histsize = HISTORYSIZE;
		/*
		 * allocate one extra element so that histptr always
		 * lies within array bounds
		 */
		histbase = areallocarray(NULL, histsize + 1, sizeof(char *),
		    APERM);
		history = histbase + 1;
		histptr = history - 1;
	}
}

static void
history_lock(int operation)
{
	while (flock(fileno(histfh), operation) != 0) {
		if (errno == EINTR || errno == EAGAIN)
			continue;
		else
			break;
	}
}

/*
 *	Routines added by Peter Collinson BSDI(Europe)/Hillside Systems to
 *	a) permit HISTSIZE to control number of lines of history stored
 *	b) maintain a physical history file
 *
 *	It turns out that there is a lot of ghastly hackery here
 */


/*
 * save command in history
 */
void
histsave(int lno, const char *cmd, int dowrite)
{
	char		*c, *cp;

	if (ignorespace && cmd[0] == ' ')
		return;

	c = str_save(cmd, APERM);
	if ((cp = strrchr(c, '\n')) != NULL)
		*cp = '\0';

	/*
	 * XXX to properly check for duplicated lines we should first reload
	 * the histfile if needed
	 */
	if (ignoredups && histptr >= history && strcmp(*histptr, c) == 0) {
		afree(c, APERM);
		return;
	}

	if (dowrite && histfh) {
#ifndef SMALL
		struct stat	sb;

		history_lock(LOCK_EX);
		if (fstat(fileno(histfh), &sb) != -1) {
			if (timespeccmp(&sb.st_mtim, &last_sb.st_mtim, ==))
				; /* file is unchanged */
			else {
				histreset();
				history_load(hist_source);
			}
		}
#endif
	}

	if (histptr < history + histsize - 1)
		histptr++;
	else { /* remove oldest command */
		afree(*history, APERM);
		memmove(history, history + 1,
		    (histsize - 1) * sizeof(*history));
	}
	*histptr = c;

	if (dowrite && histfh) {
#ifndef SMALL
		char *encoded;

		/* append to file */
		if (fseeko(histfh, 0, SEEK_END) == 0 &&
		    stravis(&encoded, c, VIS_SAFE | VIS_NL) != -1) {
			fprintf(histfh, "%s\n", encoded);
			fflush(histfh);
			fstat(fileno(histfh), &last_sb);
			line_co++;
			history_write();
			free(encoded);
		}
		history_lock(LOCK_UN);
#endif
	}
}

static FILE *
history_open(void)
{
	FILE		*f = NULL;
#ifndef SMALL
	struct stat	sb;
	int		fd, fddup;

	if ((fd = open(hname, O_RDWR | O_CREAT | O_EXLOCK, 0600)) == -1)
		return NULL;
	if (fstat(fd, &sb) == -1 || sb.st_uid != getuid()) {
		close(fd);
		return NULL;
	}
	fddup = savefd(fd);
	if (fddup != fd)
		close(fd);

	if ((f = fdopen(fddup, "r+")) == NULL)
		close(fddup);
	else
		last_sb = sb;
#endif
	return f;
}

static void
history_close(void)
{
	if (histfh) {
		fflush(histfh);
		fclose(histfh);
		histfh = NULL;
	}
}

static int
history_load(Source *s)
{
	char		*p, encoded[LINE + 1], line[LINE + 1];

	rewind(histfh);

	/* just read it all; will auto resize history upon next command */
	for (line_co = 1; ; line_co++) {
		p = fgets(encoded, sizeof(encoded), histfh);
		if (p == NULL || feof(histfh) || ferror(histfh))
			break;
		if ((p = strchr(encoded, '\n')) == NULL) {
			bi_errorf("history file is corrupt");
			return 1;
		}
		*p = '\0';
		s->line = line_co;
		s->cmd_offset = line_co;
		strunvis(line, encoded);
		histsave(line_co, line, 0);
	}

	history_write();

	return 0;
}

#define HMAGIC1 0xab
#define HMAGIC2 0xcd

void
hist_init(Source *s)
{
	int oldmagic1, oldmagic2;

	if (Flag(FTALKING) == 0)
		return;

	hstarted = 1;

	hist_source = s;

	hname = str_val(global("HISTFILE"));
	if (hname == NULL)
		return;
	hname = str_save(hname, APERM);
	histfh = history_open();
	if (histfh == NULL)
		return;

	oldmagic1 = fgetc(histfh);
	oldmagic2 = fgetc(histfh);

	if (oldmagic1 == EOF || oldmagic2 == EOF) {
		if (!feof(histfh) && ferror(histfh)) {
			history_close();
			return;
		}
	} else if (oldmagic1 == HMAGIC1 && oldmagic2 == HMAGIC2) {
		bi_errorf("ignoring old style history file");
		history_close();
		return;
	}

	rewind(histfh);

	history_load(s);

	history_lock(LOCK_UN);
}

static void
history_write(void)
{
	char		**hp, *encoded;

	/* see if file has grown over 25% */
	if (line_co < histsize + (histsize / 4))
		return;

	/* rewrite the whole caboodle */
	rewind(histfh);
	if (ftruncate(fileno(histfh), 0) == -1) {
		bi_errorf("failed to rewrite history file - %s",
		    strerror(errno));
	}
	for (hp = history; hp <= histptr; hp++) {
		if (stravis(&encoded, *hp, VIS_SAFE | VIS_NL) != -1) {
			if (fprintf(histfh, "%s\n", encoded) == -1) {
				free(encoded);
				return;
			}
			free(encoded);
		}
	}

	line_co = histsize;

	fflush(histfh);
	fstat(fileno(histfh), &last_sb);
}

void
hist_finish(void)
{
	history_close();
}

#else /* HISTORY */

/* No history to be compiled in: dummy routines to avoid lots more ifdefs */
void
init_histvec(void)
{
}
void
hist_init(Source *s)
{
}
void
hist_finish(void)
{
}
void
histsave(int lno, const char *cmd, int dowrite)
{
	errorf("history not enabled");
}
#endif /* HISTORY */


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: history.c,v 1.71 2017/09/07 19:08:32 jca Exp $ */
2
3			/*
4			* command history
5			*/
6
7			/*
8			* This file contains
9			* a) the original in-memory history mechanism
10			* b) a more complicated mechanism done by pc@hillside.co.uk
11			* that more closely follows the real ksh way of doing
12			* things.
13			*/
14
15			#include <sys/stat.h>
16			#include <sys/uio.h>
17
18			#include <errno.h>
19			#include <fcntl.h>
20			#include <stdlib.h>
21			#include <stdio.h>
22			#include <string.h>
23			#include <unistd.h>
24			#include <vis.h>
25
26			#include "sh.h"
27
28			#ifdef HISTORY
29
30			static void history_write(void);
31			static FILE *history_open(void);
32			static int history_load(Source *);
33			static void history_close(void);
34
35			static int hist_execute(char *);
36			static int hist_replace(char *, const char , const char *, int);
37			static char *hist_get(const char , int, int);
38			static char **hist_get_oldest(void);
39			static void histbackup(void);
40
41			static FILE *histfh;
42			static char *histbase; / actual start of the history[] allocation */
43			static char *current; / current position in history[] */
44			static char hname; / current name of history file */
45			static int hstarted; /* set after hist_init() called */
46			static int ignoredups; /* ditch duplicated history lines? */
47			static int ignorespace; /* ditch lines starting with a space? */
48			static Source *hist_source;
49			static uint32_t line_co;
50
51			static struct stat last_sb;
52
53			int
54			c_fc(char **wp)
55			{
56			struct shf *shf;
57			struct temp *tf = NULL;
58			char p, editor = NULL;
59			int gflag = 0, lflag = 0, nflag = 0, sflag = 0, rflag = 0;
60			int optc, ret;
61			char first = NULL, last = NULL;
62			char hfirst, hlast, **hp;
63			static int depth;
64
65	✗✓	1300	if (depth != 0) {
66			bi_errorf("history function called recursively");
67			return 1;
68			}
69
70	✗✓	650	if (!Flag(FTALKING_I)) {
71			bi_errorf("history functions not available");
72			return 1;
73			}
74
75	✓✓	3150	while ((optc = ksh_getopt(wp, &builtin_opt,
76		1575	"e:glnrs0,1,2,3,4,5,6,7,8,9,")) != -1)
77	✓✓✓✓ ✗✓✗✗ ✗✗✗✗ ✗✗✗✗ ✓✗	1900	switch (optc) {
78			case 'e':
79		250	p = builtin_opt.optarg;
80	✓✗	250	if (strcmp(p, "-") == 0)
81		250	sflag++;
82			else {
83			size_t len = strlen(p) + 4;
84			editor = str_nsave(p, len, ATEMP);
85			strlcat(editor, " $_", len);
86			}
87			break;
88			case 'g': /* non-at&t ksh */
89		25	gflag++;
90		25	break;
91			case 'l':
92		400	lflag++;
93		400	break;
94			case 'n':
95			nflag++;
96			break;
97			case 'r':
98		50	rflag++;
99		50	break;
100			case 's': /* posix version of -e - */
101			sflag++;
102			break;
103			/* kludge city - accept -num as -- -num (kind of) */
104			case '0': case '1': case '2': case '3': case '4':
105			case '5': case '6': case '7': case '8': case '9':
106		200	p = shf_smprintf("-%c%s",
107		200	optc, builtin_opt.optarg);
108	✓✓	200	if (!first)
109		100	first = p;
110	✓✗	100	else if (!last)
111			last = p;
112			else {
113			bi_errorf("too many arguments");
114			return 1;
115			}
116			break;
117			case '?':
118			return 1;
119			}
120		650	wp += builtin_opt.optind;
121
122			/* Substitute and execute command */
123	✓✓	650	if (sflag) {
124			char pat = NULL, rep = NULL;
125
126	✗✓	250	if (editor \|\| lflag \|\| nflag \|\| rflag) {
127			bi_errorf("can't use -e, -l, -n, -r with -s (-e -)");
128			return 1;
129			}
130
131			/* Check for pattern replacement argument */
132	✓✓✓✗ ✓✓	550	if (wp && wp && (p = strchr(wp + 1, '='))) {
133		125	pat = str_save(*wp, ATEMP);
134		125	p = pat + (p - *wp);
135		125	*p++ = '\0';
136			rep = p;
137		125	wp++;
138		125	}
139			/* Check for search prefix */
140	✓✗✓✓	500	if (!first && (first = *wp))
141		100	wp++;
142	✓✗✗✓	500	if (last \|\| *wp) {
143			bi_errorf("too many arguments");
144			return 1;
145			}
146
147	✓✓	750	hp = first ? hist_get(first, false, false) :
148		150	hist_get_newest(false);
149	✓✓	250	if (!hp)
150		25	return 1;
151		225	depth++;
152		225	ret = hist_replace(hp, pat, rep, gflag);
153		225	depth--;
154		225	return ret;
155			}
156
157	✗✓✗✗	400	if (editor && (lflag \|\| nflag)) {
158			bi_errorf("can't use -l, -n with -e");
159			return 1;
160			}
161
162	✓✓✓✓	700	if (!first && (first = *wp))
163		175	wp++;
164	✓✓✓✓	700	if (!last && (last = *wp))
165		125	wp++;
166	✗✓	400	if (*wp) {
167			bi_errorf("too many arguments");
168			return 1;
169			}
170	✓✓	400	if (!first) {
171	✓✗	375	hfirst = lflag ? hist_get("-16", true, true) :
172			hist_get_newest(false);
173	✗✓	125	if (!hfirst)
174			return 1;
175			/* can't fail if hfirst didn't fail */
176		125	hlast = hist_get_newest(false);
177		125	} else {
178			/* POSIX says not an error if first/last out of bounds
179			* when range is specified; at&t ksh and pdksh allow out of
180			* bounds for -l as well.
181			*/
182		550	hfirst = hist_get(first, (lflag \|\| last) ? true : false,
183		275	lflag ? true : false);
184	✗✓	275	if (!hfirst)
185			return 1;
186	✓✓	775	hlast = last ? hist_get(last, true, lflag ? true : false) :
187	✓✗	100	(lflag ? hist_get_newest(false) : hfirst);
188	✗✓	275	if (!hlast)
189			return 1;
190			}
191	✓✓	400	if (hfirst > hlast) {
192			char **temp;
193
194			temp = hfirst; hfirst = hlast; hlast = temp;
195		50	rflag = !rflag; /* POSIX */
196		50	}
197
198			/* List history */
199	✓✗	400	if (lflag) {
200			char s, t;
201		400	const char *nfmt = nflag ? "\t" : "%d\t";
202
203	✓✓	2350	for (hp = rflag ? hlast : hfirst;
204	✓✓	3150	hp >= hfirst && hp <= hlast; hp += rflag ? -1 : 1) {
205		800	shf_fprintf(shl_stdout, nfmt,
206		800	hist_source->line - (int) (histptr - hp));
207			/* print multi-line commands correctly */
208	✗✓	1600	for (s = *hp; (t = strchr(s, '\n')); s = t)
209			shf_fprintf(shl_stdout, "%.*s\t", ++t - s, s);
210		800	shf_fprintf(shl_stdout, "%s\n", s);
211			}
212		400	shf_flush(shl_stdout);
213			return 0;
214			}
215
216			/* Run editor on selected lines, then run resulting commands */
217
218			tf = maketemp(ATEMP, TT_HIST_EDIT, &genv->temps);
219			if (!(shf = tf->shf)) {
220			bi_errorf("cannot create temp file %s - %s",
221			tf->name, strerror(errno));
222			return 1;
223			}
224			for (hp = rflag ? hlast : hfirst;
225			hp >= hfirst && hp <= hlast; hp += rflag ? -1 : 1)
226			shf_fprintf(shf, "%s\n", *hp);
227			if (shf_close(shf) == EOF) {
228			bi_errorf("error writing temporary file - %s", strerror(errno));
229			return 1;
230			}
231
232			/* Ignore setstr errors here (arbitrary) */
233			setstr(local("_", false), tf->name, KSH_RETURN_ERROR);
234
235			/* XXX: source should not get trashed by this.. */
236			{
237			Source *sold = source;
238
239			ret = command(editor ? editor : "${FCEDIT:-/bin/ed} $_", 0);
240			source = sold;
241			if (ret)
242			return ret;
243			}
244
245			{
246			struct stat statb;
247			XString xs;
248			char *xp;
249			int n;
250
251			if (!(shf = shf_open(tf->name, O_RDONLY, 0, 0))) {
252			bi_errorf("cannot open temp file %s", tf->name);
253			return 1;
254			}
255
256			n = fstat(shf->fd, &statb) < 0 ? 128 :
257			statb.st_size + 1;
258			Xinit(xs, xp, n, hist_source->areap);
259			while ((n = shf_read(xp, Xnleft(xs, xp), shf)) > 0) {
260			xp += n;
261			if (Xnleft(xs, xp) <= 0)
262			XcheckN(xs, xp, Xlength(xs, xp));
263			}
264			if (n < 0) {
265			bi_errorf("error reading temp file %s - %s",
266			tf->name, strerror(shf->errno_));
267			shf_close(shf);
268			return 1;
269			}
270			shf_close(shf);
271			*xp = '\0';
272			strip_nuls(Xstring(xs, xp), Xlength(xs, xp));
273			depth++;
274			ret = hist_execute(Xstring(xs, xp));
275			depth--;
276			return ret;
277			}
278		650	}
279
280			/* Save cmd in history, execute cmd (cmd gets trashed) */
281			static int
282			hist_execute(char *cmd)
283			{
284			Source *sold;
285			int ret;
286			char p, q;
287
288		450	histbackup();
289
290	✓✓	900	for (p = cmd; p; p = q) {
291	✗✓	225	if ((q = strchr(p, '\n'))) {
292			q++ = '\0'; / kill the newline */
293			if (!q) / ignore trailing newline */
294			q = NULL;
295			}
296		225	histsave(++(hist_source->line), p, 1);
297
298		225	shellf("%s\n", p); /* POSIX doesn't say this is done... */
299	✗✓	225	if ((p = q)) /* restore \n (trailing \n not restored) */
300			q[-1] = '\n';
301			}
302
303			/* Commands are executed here instead of pushing them onto the
304			* input 'cause posix says the redirection and variable assignments
305			* in
306			* X=y fc -e - 42 2> /dev/null
307			* are to effect the repeated commands environment.
308			*/
309			/* XXX: source should not get trashed by this.. */
310		225	sold = source;
311		225	ret = command(cmd, 0);
312		225	source = sold;
313		225	return ret;
314			}
315
316			static int
317			hist_replace(char *hp, const char pat, const char *rep, int global)
318			{
319			char *line;
320
321	✓✓	450	if (!pat)
322		100	line = str_save(*hp, ATEMP);
323			else {
324			char s, s1;
325		125	int pat_len = strlen(pat);
326		125	int rep_len = strlen(rep);
327			int len;
328		125	XString xs;
329			char *xp;
330			int any_subst = 0;
331
332		125	Xinit(xs, xp, 128, ATEMP);
333	✓✓✓✗	1000	for (s = *hp; (s1 = strstr(s, pat)) && (!any_subst \|\| global);
334		250	s = s1 + pat_len) {
335			any_subst = 1;
336		250	len = s1 - s;
337	✗✓	250	XcheckN(xs, xp, len + rep_len);
338		250	memcpy(xp, s, len); /* first part */
339		250	xp += len;
340		250	memcpy(xp, rep, rep_len); /* replacement */
341		250	xp += rep_len;
342			}
343	✗✓	125	if (!any_subst) {
344			bi_errorf("substitution failed");
345			return 1;
346			}
347		125	len = strlen(s) + 1;
348	✗✓	125	XcheckN(xs, xp, len);
349		125	memcpy(xp, s, len);
350		125	xp += len;
351		125	line = Xclose(xs, xp);
352	✓✗	250	}
353		225	return hist_execute(line);
354		225	}
355
356			/*
357			* get pointer to history given pattern
358			* pattern is a number or string
359			*/
360			static char **
361			hist_get(const char *str, int approx, int allow_cur)
362			{
363			char **hp = NULL;
364		1450	int n;
365
366	✓✓	725	if (getn(str, &n)) {
367	✓✓	1500	hp = histptr + (n < 0 ? n : (n - hist_source->line));
368	✓✓	625	if ((long)hp < (long)history) {
369	✓✗	175	if (approx)
370		175	hp = hist_get_oldest();
371			else {
372			bi_errorf("%s: not in history", str);
373			hp = NULL;
374			}
375	✓✓	450	} else if (hp > histptr) {
376	✓✗	25	if (approx)
377		25	hp = hist_get_newest(allow_cur);
378			else {
379			bi_errorf("%s: not in history", str);
380			hp = NULL;
381			}
382	✗✓✗✗	425	} else if (!allow_cur && hp == histptr) {
383			bi_errorf("%s: invalid range", str);
384			hp = NULL;
385			}
386			} else {
387	✓✓	225	int anchored = *str == '?' ? (++str, 0) : 1;
388
389			/* the -1 is to avoid the current fc command */
390		100	n = findhist(histptr - history - 1, 0, str, anchored);
391	✗✓	100	if (n < 0) {
392			bi_errorf("%s: not in history", str);
393			hp = NULL;
394			} else
395		100	hp = &history[n];
396			}
397		725	return hp;
398		725	}
399
400			/* Return a pointer to the newest command in the history */
401			char **
402			hist_get_newest(int allow_cur)
403			{
404	✓✗✓✓ ✓✓	1375	if (histptr < history \|\| (!allow_cur && histptr == history)) {
405		25	bi_errorf("no history (yet)");
406		25	return NULL;
407			}
408	✓✓	325	if (allow_cur)
409		25	return histptr;
410		300	return histptr - 1;
411		350	}
412
413			/* Return a pointer to the oldest command in the history */
414			static char **
415			hist_get_oldest(void)
416			{
417	✗✓	350	if (histptr <= history) {
418			bi_errorf("no history (yet)");
419			return NULL;
420			}
421		175	return history;
422		175	}
423
424			/******************************/
425			/* Back up over last histsave */
426			/******************************/
427			static void
428			histbackup(void)
429			{
430			static int last_line = -1;
431
432	✓✗✓✗	675	if (histptr >= history && last_line != hist_source->line) {
433		225	hist_source->line--;
434		225	afree(*histptr, APERM);
435		225	histptr--;
436		225	last_line = hist_source->line;
437		225	}
438		225	}
439
440			static void
441			histreset(void)
442			{
443			char **hp;
444
445			for (hp = history; hp <= histptr; hp++)
446			afree(*hp, APERM);
447
448			histptr = history - 1;
449			hist_source->line = 0;
450			}
451
452			/*
453			* Return the current position.
454			*/
455			char **
456			histpos(void)
457			{
458			return current;
459			}
460
461			int
462			histnum(int n)
463			{
464		3550	int last = histptr - history;
465
466	✗✓✗✗	1775	if (n < 0 \|\| n >= last) {
467		1775	current = histptr;
468		1775	return last;
469			} else {
470			current = &history[n];
471			return n;
472			}
473		1775	}
474
475			/*
476			* This will become unnecessary if hist_get is modified to allow
477			* searching from positions other than the end, and in either
478			* direction.
479			*/
480			int
481			findhist(int start, int fwd, const char *str, int anchored)
482			{
483			char **hp;
484		200	int maxhist = histptr - history;
485		100	int incr = fwd ? 1 : -1;
486		100	int len = strlen(str);
487
488	✓✗✗✓	200	if (start < 0 \|\| start >= maxhist)
489			start = maxhist;
490
491		100	hp = &history[start];
492	✓✗✓✗	450	for (; hp >= history && hp <= histptr; hp += incr)
493	✓✓✓✓ ✓✓	300	if ((anchored && strncmp(*hp, str, len) == 0) \|\|
494	✓✓	125	(!anchored && strstr(*hp, str)))
495		100	return hp - history;
496
497			return -1;
498		100	}
499
500			int
501			findhistrel(const char *str)
502			{
503			int maxhist = histptr - history;
504			int start = maxhist - 1;
505			int rec = atoi(str);
506
507			if (rec == 0)
508			return -1;
509			if (rec > 0) {
510			if (rec > maxhist)
511			return -1;
512			return rec - 1;
513			}
514			if (rec > maxhist)
515			return -1;
516			return start + rec + 1;
517			}
518
519			void
520			sethistcontrol(const char *str)
521			{
522		150	char spec, tok, *state;
523
524		75	ignorespace = 0;
525		75	ignoredups = 0;
526
527	✗✓	75	if (str == NULL)
528			return;
529
530		75	spec = str_save(str, ATEMP);
531	✓✓	400	for (tok = strtok_r(spec, ":", &state); tok != NULL;
532		225	tok = strtok_r(NULL, ":", &state)) {
533	✓✓	125	if (strcmp(tok, "ignoredups") == 0)
534			ignoredups = 1;
535	✓✓	75	else if (strcmp(tok, "ignorespace") == 0)
536			ignorespace = 1;
537			}
538		75	afree(spec, ATEMP);
539		150	}
540
541			/*
542			* set history
543			* this means reallocating the dataspace
544			*/
545			void
546			sethistsize(int n)
547			{
548	✓✗✓✗	150	if (n > 0 && n != histsize) {
549		50	int offset = histptr - history;
550
551			/* save most recent history */
552	✗✓	50	if (offset > n - 1) {
553			char **hp;
554
555			offset = n - 1;
556			for (hp = history; hp < histptr - offset; hp++)
557			afree(*hp, APERM);
558			memmove(history, histptr - offset, n * sizeof(char *));
559			}
560
561		50	histsize = n;
562		50	histbase = areallocarray(histbase, n + 1, sizeof(char *), APERM);
563		50	history = histbase + 1;
564		50	histptr = history + offset;
565		50	}
566		50	}
567
568			/*
569			* set history file
570			* This can mean reloading/resetting/starting history file
571			* maintenance
572			*/
573			void
574			sethistfile(const char *name)
575			{
576			/* if not started then nothing to do */
577	✗✓	17750	if (hstarted == 0)
578			return;
579
580			/* if the name is the same as the name we have */
581			if (hname && strcmp(hname, name) == 0)
582			return;
583			/*
584			* its a new name - possibly
585			*/
586			if (hname) {
587			afree(hname, APERM);
588			hname = NULL;
589			histreset();
590			}
591
592			history_close();
593			hist_init(hist_source);
594		8875	}
595
596			/*
597			* initialise the history vector
598			*/
599			void
600			init_histvec(void)
601			{
602	✓✗	435540	if (histbase == NULL) {
603		217770	histsize = HISTORYSIZE;
604			/*
605			* allocate one extra element so that histptr always
606			* lies within array bounds
607			*/
608		217770	histbase = areallocarray(NULL, histsize + 1, sizeof(char *),
609			APERM);
610		217770	history = histbase + 1;
611		217770	histptr = history - 1;
612		217770	}
613		217770	}
614
615			static void
616			history_lock(int operation)
617			{
618	✓✗✗✓	29500	while (flock(fileno(histfh), operation) != 0) {
619			if (errno == EINTR \|\| errno == EAGAIN)
620			continue;
621			else
622			break;
623			}
624		5900	}
625
626			/*
627			* Routines added by Peter Collinson BSDI(Europe)/Hillside Systems to
628			* a) permit HISTSIZE to control number of lines of history stored
629			* b) maintain a physical history file
630			*
631			* It turns out that there is a lot of ghastly hackery here
632			*/
633
634
635			/*
636			* save command in history
637			*/
638			void
639			histsave(int lno, const char *cmd, int dowrite)
640			{
641			char c, cp;
642
643	✓✓✓✓	8345	if (ignorespace && cmd[0] == ' ')
644		50	return;
645
646		4035	c = str_save(cmd, APERM);
647	✓✓	4035	if ((cp = strrchr(c, '\n')) != NULL)
648		3810	*cp = '\0';
649
650			/*
651			* XXX to properly check for duplicated lines we should first reload
652			* the histfile if needed
653			*/
654	✓✓✓✓ ✓✓	4285	if (ignoredups && histptr >= history && strcmp(*histptr, c) == 0) {
655		50	afree(c, APERM);
656		50	return;
657			}
658
659	✓✓	3985	if (dowrite && histfh) {
660			#ifndef SMALL
661		2625	struct stat sb;
662
663		2625	history_lock(LOCK_EX);
664	✓✗✓✗	7875	if (fstat(fileno(histfh), &sb) != -1) {
665	✓✗✗✓ ✗✗	5250	if (timespeccmp(&sb.st_mtim, &last_sb.st_mtim, ==))
666			; /* file is unchanged */
667			else {
668			histreset();
669			history_load(hist_source);
670			}
671			}
672			#endif
673		2625	}
674
675	✓✓	3985	if (histptr < history + histsize - 1)
676		3835	histptr++;
677			else { /* remove oldest command */
678		150	afree(*history, APERM);
679		300	memmove(history, history + 1,
680		150	(histsize - 1) * sizeof(*history));
681			}
682		3985	*histptr = c;
683
684	✓✓	3985	if (dowrite && histfh) {
685			#ifndef SMALL
686		2625	char *encoded;
687
688			/* append to file */
689	✓✗✓✗	5250	if (fseeko(histfh, 0, SEEK_END) == 0 &&
690		2625	stravis(&encoded, c, VIS_SAFE \| VIS_NL) != -1) {
691		2625	fprintf(histfh, "%s\n", encoded);
692		2625	fflush(histfh);
693	✓✗	7875	fstat(fileno(histfh), &last_sb);
694		2625	line_co++;
695		2625	history_write();
696		2625	free(encoded);
697		2625	}
698		2625	history_lock(LOCK_UN);
699			#endif
700		2625	}
701		8070	}
702
703			static FILE *
704			history_open(void)
705			{
706			FILE *f = NULL;
707			#ifndef SMALL
708		7248	struct stat sb;
709			int fd, fddup;
710
711	✓✓	3624	if ((fd = open(hname, O_RDWR \| O_CREAT \| O_EXLOCK, 0600)) == -1)
712		2974	return NULL;
713	✓✗✗✓	1300	if (fstat(fd, &sb) == -1 \|\| sb.st_uid != getuid()) {
714			close(fd);
715			return NULL;
716			}
717		650	fddup = savefd(fd);
718	✓✗	650	if (fddup != fd)
719		650	close(fd);
720
721	✗✓	650	if ((f = fdopen(fddup, "r+")) == NULL)
722			close(fddup);
723			else
724		650	last_sb = sb;
725			#endif
726		650	return f;
727		3624	}
728
729			static void
730			history_close(void)
731			{
732	✓✓	7032	if (histfh) {
733		600	fflush(histfh);
734		600	fclose(histfh);
735		600	histfh = NULL;
736		600	}
737		3516	}
738
739			static int
740			history_load(Source *s)
741			{
742		1300	char *p, encoded[LINE + 1], line[LINE + 1];
743
744		650	rewind(histfh);
745
746			/* just read it all; will auto resize history upon next command */
747		650	for (line_co = 1; ; line_co++) {
748		650	p = fgets(encoded, sizeof(encoded), histfh);
749	✗✓✗✗ ✗✗✗✗ ✗✗✗✗ ✗✗	650	if (p == NULL \|\| feof(histfh) \|\| ferror(histfh))
750			break;
751			if ((p = strchr(encoded, '\n')) == NULL) {
752			bi_errorf("history file is corrupt");
753			return 1;
754			}
755			*p = '\0';
756			s->line = line_co;
757			s->cmd_offset = line_co;
758			strunvis(line, encoded);
759			histsave(line_co, line, 0);
760			}
761
762		650	history_write();
763
764		650	return 0;
765		650	}
766
767			#define HMAGIC1 0xab
768			#define HMAGIC2 0xcd
769
770			void
771			hist_init(Source *s)
772			{
773			int oldmagic1, oldmagic2;
774
775	✗✓	7248	if (Flag(FTALKING) == 0)
776			return;
777
778		3624	hstarted = 1;
779
780		3624	hist_source = s;
781
782		3624	hname = str_val(global("HISTFILE"));
783	✗✓	3624	if (hname == NULL)
784			return;
785		3624	hname = str_save(hname, APERM);
786		3624	histfh = history_open();
787	✓✓	3624	if (histfh == NULL)
788		2974	return;
789
790		650	oldmagic1 = fgetc(histfh);
791		650	oldmagic2 = fgetc(histfh);
792
793	✓✗	650	if (oldmagic1 == EOF \|\| oldmagic2 == EOF) {
794	✓✗✗✓ ✗✗✗✗ ✗✗✗✗	1300	if (!feof(histfh) && ferror(histfh)) {
795			history_close();
796			return;
797			}
798			} else if (oldmagic1 == HMAGIC1 && oldmagic2 == HMAGIC2) {
799			bi_errorf("ignoring old style history file");
800			history_close();
801			return;
802			}
803
804		650	rewind(histfh);
805
806		650	history_load(s);
807
808		650	history_lock(LOCK_UN);
809		4274	}
810
811			static void
812			history_write(void)
813			{
814		6550	char *hp, encoded;
815
816			/* see if file has grown over 25% */
817	✓✓	3275	if (line_co < histsize + (histsize / 4))
818		3025	return;
819
820			/* rewrite the whole caboodle */
821		250	rewind(histfh);
822	✓✗✗✓	750	if (ftruncate(fileno(histfh), 0) == -1) {
823			bi_errorf("failed to rewrite history file - %s",
824			strerror(errno));
825			}
826	✓✓	1900	for (hp = history; hp <= histptr; hp++) {
827	✓✗	700	if (stravis(&encoded, *hp, VIS_SAFE \| VIS_NL) != -1) {
828	✗✓	1400	if (fprintf(histfh, "%s\n", encoded) == -1) {
829		700	free(encoded);
830			return;
831			}
832			free(encoded);
833			}
834			}
835
836		250	line_co = histsize;
837
838		250	fflush(histfh);
839	✓✗	750	fstat(fileno(histfh), &last_sb);
840		3525	}
841
842			void
843			hist_finish(void)
844			{
845		7032	history_close();
846		3516	}
847
848			#else /* HISTORY */
849
850			/* No history to be compiled in: dummy routines to avoid lots more ifdefs */
851			void
852			init_histvec(void)
853			{
854			}
855			void
856			hist_init(Source *s)
857			{
858			}
859			void
860			hist_finish(void)
861			{
862			}
863			void
864			histsave(int lno, const char *cmd, int dowrite)
865			{
866			errorf("history not enabled");
867			}
868			#endif /* HISTORY */