Module Name: src
Committed By: asau
Date: Sat Feb 28 21:56:53 UTC 2015
Modified Files:
src/usr.bin/sed: compile.c extern.h main.c process.c
Log Message:
Improve modularity of "sed" source:
- move program source input subroutines into compiler part;
- move data I/O subroutines into processor part.
To generate a diff of this commit:
cvs rdiff -u -r1.43 -r1.44 src/usr.bin/sed/compile.c
cvs rdiff -u -r1.14 -r1.15 src/usr.bin/sed/extern.h
cvs rdiff -u -r1.30 -r1.31 src/usr.bin/sed/main.c
cvs rdiff -u -r1.46 -r1.47 src/usr.bin/sed/process.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/usr.bin/sed/compile.c
diff -u src/usr.bin/sed/compile.c:1.43 src/usr.bin/sed/compile.c:1.44
--- src/usr.bin/sed/compile.c:1.43 Thu Jun 26 02:14:32 2014
+++ src/usr.bin/sed/compile.c Sat Feb 28 21:56:53 2015
@@ -1,4 +1,4 @@
-/* $NetBSD: compile.c,v 1.43 2014/06/26 02:14:32 christos Exp $ */
+/* $NetBSD: compile.c,v 1.44 2015/02/28 21:56:53 asau Exp $ */
/*-
* Copyright (c) 1992 Diomidis Spinellis.
@@ -38,7 +38,7 @@
#endif
#include <sys/cdefs.h>
-__RCSID("$NetBSD: compile.c,v 1.43 2014/06/26 02:14:32 christos Exp $");
+__RCSID("$NetBSD: compile.c,v 1.44 2015/02/28 21:56:53 asau Exp $");
#ifdef __FBSDID
__FBSDID("$FreeBSD: head/usr.bin/sed/compile.c 259132 2013-12-09 18:57:20Z eadler $");
#endif
@@ -73,6 +73,8 @@ static struct labhash {
int lh_ref;
} *labels[LHSZ];
+static char *cu_fgets(char *, int, int *);
+
static char *compile_addr(char *, struct s_addr *);
static char *compile_ccl(char **, char *);
static char *compile_delimited(char *, char *, int);
@@ -91,6 +93,14 @@ static void fixuplabel(struct s_comman
static void uselabel(void);
/*
+ * Current file and line number; line numbers restart across compilation
+ * units, but span across input files. The latter is optional if editing
+ * in place.
+ */
+static const char *fname; /* File name. */
+static u_long linenum;
+
+/*
* Command specification. This is used to drive the command parser.
*/
struct s_format {
@@ -945,3 +955,99 @@ uselabel(void)
}
}
}
+
+/*
+ * Like fgets, but go through the chain of compilation units chaining them
+ * together. Empty strings and files are ignored.
+ */
+char *
+cu_fgets(char *buf, int n, int *more)
+{
+ static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
+ static FILE *f; /* Current open file */
+ static char *s; /* Current pointer inside string */
+ static char string_ident[30];
+ char *p;
+
+again:
+ switch (state) {
+ case ST_EOF:
+ if (script == NULL) {
+ if (more != NULL)
+ *more = 0;
+ return (NULL);
+ }
+ linenum = 0;
+ switch (script->type) {
+ case CU_FILE:
+ if ((f = fopen(script->s, "r")) == NULL)
+ err(1, "%s", script->s);
+ fname = script->s;
+ state = ST_FILE;
+ goto again;
+ case CU_STRING:
+ if (((size_t)snprintf(string_ident,
+ sizeof(string_ident), "\"%s\"", script->s)) >=
+ sizeof(string_ident) - 1)
+ (void)strcpy(string_ident +
+ sizeof(string_ident) - 6, " ...\"");
+ fname = string_ident;
+ s = script->s;
+ state = ST_STRING;
+ goto again;
+ }
+ case ST_FILE:
+ if ((p = fgets(buf, n, f)) != NULL) {
+ linenum++;
+ if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
+ nflag = 1;
+ if (more != NULL)
+ *more = !feof(f);
+ return (p);
+ }
+ script = script->next;
+ (void)fclose(f);
+ state = ST_EOF;
+ goto again;
+ case ST_STRING:
+ if (linenum == 0 && s[0] == '#' && s[1] == 'n')
+ nflag = 1;
+ p = buf;
+ for (;;) {
+ if (n-- <= 1) {
+ *p = '\0';
+ linenum++;
+ if (more != NULL)
+ *more = 1;
+ return (buf);
+ }
+ switch (*s) {
+ case '\0':
+ state = ST_EOF;
+ if (s == script->s) {
+ script = script->next;
+ goto again;
+ } else {
+ script = script->next;
+ *p = '\0';
+ linenum++;
+ if (more != NULL)
+ *more = 0;
+ return (buf);
+ }
+ case '\n':
+ *p++ = '\n';
+ *p = '\0';
+ s++;
+ linenum++;
+ if (more != NULL)
+ *more = 0;
+ return (buf);
+ default:
+ *p++ = *s++;
+ }
+ }
+ }
+ /* NOTREACHED */
+ return (NULL);
+}
Index: src/usr.bin/sed/extern.h
diff -u src/usr.bin/sed/extern.h:1.14 src/usr.bin/sed/extern.h:1.15
--- src/usr.bin/sed/extern.h:1.14 Fri Jun 6 21:56:39 2014
+++ src/usr.bin/sed/extern.h Sat Feb 28 21:56:53 2015
@@ -1,4 +1,4 @@
-/* $NetBSD: extern.h,v 1.14 2014/06/06 21:56:39 wiz Exp $ */
+/* $NetBSD: extern.h,v 1.15 2015/02/28 21:56:53 asau Exp $ */
/*-
* Copyright (c) 1992 Diomidis Spinellis.
@@ -36,24 +36,39 @@
* $FreeBSD: head/usr.bin/sed/extern.h 170608 2007-06-12 12:05:24Z yar $
*/
+/*
+ * Linked list of units (strings and files) to be compiled
+ */
+struct s_compunit {
+ struct s_compunit *next;
+ enum e_cut {CU_FILE, CU_STRING} type;
+ char *s; /* Pointer to string or fname */
+};
+
+/*
+ * Linked list of files to be processed
+ */
+struct s_flist {
+ char *fname;
+ struct s_flist *next;
+};
+
+extern struct s_compunit *script;
+extern struct s_flist *files;
extern struct s_command *prog;
extern struct s_appends *appends;
extern regmatch_t *match;
extern size_t maxnsub;
-extern u_long linenum;
extern size_t appendnum;
-extern int aflag, eflag, nflag;
-extern const char *fname, *outfname;
+extern int aflag, nflag;
+extern int ispan;
extern FILE *infile, *outfile;
extern int rflags; /* regex flags to use */
void cfclose(struct s_command *, struct s_command *);
void compile(void);
void cspace(SPACE *, const char *, size_t, enum e_spflag);
-char *cu_fgets(char *, int, int *);
-int mf_fgets(SPACE *, enum e_spflag);
-int lastline(void);
-void process(void);
+int process(void);
void resetstate(void);
char *strregerror(int, regex_t *);
void *xmalloc(size_t);
Index: src/usr.bin/sed/main.c
diff -u src/usr.bin/sed/main.c:1.30 src/usr.bin/sed/main.c:1.31
--- src/usr.bin/sed/main.c:1.30 Thu Jun 26 02:14:32 2014
+++ src/usr.bin/sed/main.c Sat Feb 28 21:56:53 2015
@@ -1,4 +1,4 @@
-/* $NetBSD: main.c,v 1.30 2014/06/26 02:14:32 christos Exp $ */
+/* $NetBSD: main.c,v 1.31 2015/02/28 21:56:53 asau Exp $ */
/*-
* Copyright (c) 2013 Johann 'Myrkraverk' Oskarsson.
@@ -39,7 +39,7 @@
#endif
#include <sys/cdefs.h>
-__RCSID("$NetBSD: main.c,v 1.30 2014/06/26 02:14:32 christos Exp $");
+__RCSID("$NetBSD: main.c,v 1.31 2015/02/28 21:56:53 asau Exp $");
#ifdef __FBSDID
__FBSDID("$FreeBSD: head/usr.bin/sed/main.c 252231 2013-06-26 04:14:19Z pfg $");
#endif
@@ -61,7 +61,6 @@ static const char sccsid[] = "@(#)main.c
#include <err.h>
#include <errno.h>
#include <fcntl.h>
-#include <libgen.h>
#include <limits.h>
#include <locale.h>
#include <regex.h>
@@ -76,54 +75,29 @@ static const char sccsid[] = "@(#)main.c
#include "extern.h"
/*
- * Linked list of units (strings and files) to be compiled
- */
-struct s_compunit {
- struct s_compunit *next;
- enum e_cut {CU_FILE, CU_STRING} type;
- char *s; /* Pointer to string or fname */
-};
-
-/*
* Linked list pointer to compilation units and pointer to current
* next pointer.
*/
-static struct s_compunit *script, **cu_nextp = &script;
-
-/*
- * Linked list of files to be processed
- */
-struct s_flist {
- char *fname;
- struct s_flist *next;
-};
+struct s_compunit *script;
+static struct s_compunit **cu_nextp = &script;
/*
* Linked list pointer to files and pointer to current
* next pointer.
*/
-static struct s_flist *files, **fl_nextp = &files;
+struct s_flist *files;
+static struct s_flist **fl_nextp = &files;
FILE *infile; /* Current input file */
FILE *outfile; /* Current output file */
-int aflag, eflag, nflag;
+int aflag;
+static int eflag;
+int nflag;
int rflags = 0;
-static int rval; /* Exit status */
-static int ispan; /* Whether inplace editing spans across files */
-
-/*
- * Current file and line number; line numbers restart across compilation
- * units, but span across input files. The latter is optional if editing
- * in place.
- */
-const char *fname; /* File name. */
-const char *outfname; /* Output file name */
-static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */
-static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */
-static const char *inplace; /* Inplace edit file extension. */
-u_long linenum;
+int ispan; /* Whether inplace editing spans across files */
+const char *inplace; /* Inplace edit file extension. */
static void add_compunit(enum e_cut, char *);
static void add_file(char *);
@@ -132,6 +106,7 @@ static void usage(void) __dead;
int
main(int argc, char *argv[])
{
+ int rval; /* Exit status */
int c, fflag;
char *temp_arg;
@@ -212,7 +187,7 @@ main(int argc, char *argv[])
add_file(*argv);
else
add_file(NULL);
- process();
+ rval = process();
cfclose(prog, NULL);
if (fclose(stdout))
err(1, "stdout");
@@ -230,249 +205,6 @@ usage(void)
}
/*
- * Like fgets, but go through the chain of compilation units chaining them
- * together. Empty strings and files are ignored.
- */
-char *
-cu_fgets(char *buf, int n, int *more)
-{
- static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
- static FILE *f; /* Current open file */
- static char *s; /* Current pointer inside string */
- static char string_ident[30];
- char *p;
-
-again:
- switch (state) {
- case ST_EOF:
- if (script == NULL) {
- if (more != NULL)
- *more = 0;
- return (NULL);
- }
- linenum = 0;
- switch (script->type) {
- case CU_FILE:
- if ((f = fopen(script->s, "r")) == NULL)
- err(1, "%s", script->s);
- fname = script->s;
- state = ST_FILE;
- goto again;
- case CU_STRING:
- if (((size_t)snprintf(string_ident,
- sizeof(string_ident), "\"%s\"", script->s)) >=
- sizeof(string_ident) - 1)
- (void)strcpy(string_ident +
- sizeof(string_ident) - 6, " ...\"");
- fname = string_ident;
- s = script->s;
- state = ST_STRING;
- goto again;
- }
- case ST_FILE:
- if ((p = fgets(buf, n, f)) != NULL) {
- linenum++;
- if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
- nflag = 1;
- if (more != NULL)
- *more = !feof(f);
- return (p);
- }
- script = script->next;
- (void)fclose(f);
- state = ST_EOF;
- goto again;
- case ST_STRING:
- if (linenum == 0 && s[0] == '#' && s[1] == 'n')
- nflag = 1;
- p = buf;
- for (;;) {
- if (n-- <= 1) {
- *p = '\0';
- linenum++;
- if (more != NULL)
- *more = 1;
- return (buf);
- }
- switch (*s) {
- case '\0':
- state = ST_EOF;
- if (s == script->s) {
- script = script->next;
- goto again;
- } else {
- script = script->next;
- *p = '\0';
- linenum++;
- if (more != NULL)
- *more = 0;
- return (buf);
- }
- case '\n':
- *p++ = '\n';
- *p = '\0';
- s++;
- linenum++;
- if (more != NULL)
- *more = 0;
- return (buf);
- default:
- *p++ = *s++;
- }
- }
- }
- /* NOTREACHED */
- return (NULL);
-}
-
-/*
- * Like fgets, but go through the list of files chaining them together.
- * Set len to the length of the line.
- */
-int
-mf_fgets(SPACE *sp, enum e_spflag spflag)
-{
- struct stat sb;
- size_t len;
- static char *p = NULL;
- static size_t plen = 0;
- int c;
- static int firstfile;
-
- if (infile == NULL) {
- /* stdin? */
- if (files->fname == NULL) {
- if (inplace != NULL)
- errx(1, "-I or -i may not be used with stdin");
- infile = stdin;
- fname = "stdin";
- outfile = stdout;
- outfname = "stdout";
- }
- firstfile = 1;
- }
-
- for (;;) {
- if (infile != NULL && (c = getc(infile)) != EOF) {
- (void)ungetc(c, infile);
- break;
- }
- /* If we are here then either eof or no files are open yet */
- if (infile == stdin) {
- sp->len = 0;
- return (0);
- }
- if (infile != NULL) {
- fclose(infile);
- if (*oldfname != '\0') {
- /* if there was a backup file, remove it */
- unlink(oldfname);
- /*
- * Backup the original. Note that hard links
- * are not supported on all filesystems.
- */
- if ((link(fname, oldfname) != 0) &&
- (rename(fname, oldfname) != 0)) {
- warn("rename()");
- if (*tmpfname)
- unlink(tmpfname);
- exit(1);
- }
- *oldfname = '\0';
- }
- if (*tmpfname != '\0') {
- if (outfile != NULL && outfile != stdout)
- if (fclose(outfile) != 0) {
- warn("fclose()");
- unlink(tmpfname);
- exit(1);
- }
- outfile = NULL;
- if (rename(tmpfname, fname) != 0) {
- /* this should not happen really! */
- warn("rename()");
- unlink(tmpfname);
- exit(1);
- }
- *tmpfname = '\0';
- }
- outfname = NULL;
- }
- if (firstfile == 0)
- files = files->next;
- else
- firstfile = 0;
- if (files == NULL) {
- sp->len = 0;
- return (0);
- }
- fname = files->fname;
- if (inplace != NULL) {
- if (lstat(fname, &sb) != 0)
- err(1, "%s", fname);
- if (!(sb.st_mode & S_IFREG))
- errx(1, "%s: %s %s", fname,
- "in-place editing only",
- "works for regular files");
- if (*inplace != '\0') {
- strlcpy(oldfname, fname,
- sizeof(oldfname));
- len = strlcat(oldfname, inplace,
- sizeof(oldfname));
- if (len > sizeof(oldfname))
- errx(1, "%s: name too long", fname);
- }
- char d_name[PATH_MAX], f_name[PATH_MAX];
- (void)strlcpy(d_name, fname, sizeof(d_name));
- (void)strlcpy(f_name, fname, sizeof(f_name));
- len = (size_t)snprintf(tmpfname, sizeof(tmpfname),
- "%s/.!%ld!%s", dirname(d_name), (long)getpid(),
- basename(f_name));
- if (len >= sizeof(tmpfname))
- errx(1, "%s: name too long", fname);
- unlink(tmpfname);
- if (outfile != NULL && outfile != stdout)
- fclose(outfile);
- if ((outfile = fopen(tmpfname, "w")) == NULL)
- err(1, "%s", fname);
- fchown(fileno(outfile), sb.st_uid, sb.st_gid);
- fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
- outfname = tmpfname;
- if (!ispan) {
- linenum = 0;
- resetstate();
- }
- } else {
- outfile = stdout;
- outfname = "stdout";
- }
- if ((infile = fopen(fname, "r")) == NULL) {
- warn("%s", fname);
- rval = 1;
- continue;
- }
- }
- /*
- * We are here only when infile is open and we still have something
- * to read from it.
- *
- * Use getline() so that we can handle essentially infinite input
- * data. The p and plen are static so each invocation gives
- * getline() the same buffer which is expanded as needed.
- */
- ssize_t slen = getline(&p, &plen, infile);
- if (slen == -1)
- err(1, "%s", fname);
- if (slen != 0 && p[slen - 1] == '\n')
- slen--;
- cspace(sp, p, (size_t)slen, spflag);
-
- linenum++;
-
- return (1);
-}
-
-/*
* Add a compilation unit to the linked list
*/
static void
@@ -502,16 +234,3 @@ add_file(char *s)
fp->fname = s;
fl_nextp = &fp->next;
}
-
-int
-lastline(void)
-{
- int ch;
-
- if (files->next != NULL && (inplace == NULL || ispan))
- return (0);
- if ((ch = getc(infile)) == EOF)
- return (1);
- ungetc(ch, infile);
- return (0);
-}
Index: src/usr.bin/sed/process.c
diff -u src/usr.bin/sed/process.c:1.46 src/usr.bin/sed/process.c:1.47
--- src/usr.bin/sed/process.c:1.46 Wed Aug 13 11:35:34 2014
+++ src/usr.bin/sed/process.c Sat Feb 28 21:56:53 2015
@@ -1,4 +1,4 @@
-/* $NetBSD: process.c,v 1.46 2014/08/13 11:35:34 christos Exp $ */
+/* $NetBSD: process.c,v 1.47 2015/02/28 21:56:53 asau Exp $ */
/*-
* Copyright (c) 1992 Diomidis Spinellis.
@@ -38,7 +38,7 @@
#endif
#include <sys/cdefs.h>
-__RCSID("$NetBSD: process.c,v 1.46 2014/08/13 11:35:34 christos Exp $");
+__RCSID("$NetBSD: process.c,v 1.47 2015/02/28 21:56:53 asau Exp $");
#ifdef __FBSDID
__FBSDID("$FreeBSD: head/usr.bin/sed/process.c 192732 2009-05-25 06:45:33Z brian $");
#endif
@@ -56,6 +56,7 @@ static const char sccsid[] = "@(#)proces
#include <err.h>
#include <errno.h>
#include <fcntl.h>
+#include <libgen.h>
#include <limits.h>
#include <regex.h>
#include <stdio.h>
@@ -75,6 +76,9 @@ static SPACE HS, PS, SS, YS;
#define hs HS.space
#define hsl HS.len
+static int mf_fgets(SPACE *, enum e_spflag);
+static int lastline(void);
+
static __inline int applies(struct s_command *);
static void do_tr(struct s_tr *);
static void flush_appends(void);
@@ -83,6 +87,20 @@ static __inline int regexec_e(regex_t *
static void regsub(SPACE *, char *, char *);
static int substitute(struct s_command *);
+/*
+ * Current file and line number; line numbers restart across compilation
+ * units, but span across input files. The latter is optional if editing
+ * in place.
+ */
+static const char *fname; /* File name. */
+static const char *outfname; /* Output file name */
+static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */
+static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */
+static const char *inplace; /* Inplace edit file extension. */
+static u_long linenum;
+
+static int rval; /* Exit status */
+
struct s_appends *appends; /* Array of pointers to strings to append. */
static size_t appendx; /* Index into appends array. */
size_t appendnum; /* Size of appends array. */
@@ -96,7 +114,7 @@ regmatch_t *match;
#define OUT() do {fwrite(ps, 1, psl, outfile); fputc('\n', outfile);} while (0)
-void
+int
process(void)
{
struct s_command *cp;
@@ -271,6 +289,7 @@ new: if (!nflag && !pd)
OUT();
flush_appends();
} /* for all lines */
+ return rval;
}
/*
@@ -790,3 +809,163 @@ cfclose(struct s_command *cp, struct s_c
break;
}
}
+
+/*
+ * Like fgets, but go through the list of files chaining them together.
+ * Set len to the length of the line.
+ */
+int
+mf_fgets(SPACE *sp, enum e_spflag spflag)
+{
+ struct stat sb;
+ size_t len;
+ static char *p = NULL;
+ static size_t plen = 0;
+ int c;
+ static int firstfile;
+
+ if (infile == NULL) {
+ /* stdin? */
+ if (files->fname == NULL) {
+ if (inplace != NULL)
+ errx(1, "-I or -i may not be used with stdin");
+ infile = stdin;
+ fname = "stdin";
+ outfile = stdout;
+ outfname = "stdout";
+ }
+ firstfile = 1;
+ }
+
+ for (;;) {
+ if (infile != NULL && (c = getc(infile)) != EOF) {
+ (void)ungetc(c, infile);
+ break;
+ }
+ /* If we are here then either eof or no files are open yet */
+ if (infile == stdin) {
+ sp->len = 0;
+ return (0);
+ }
+ if (infile != NULL) {
+ fclose(infile);
+ if (*oldfname != '\0') {
+ /* if there was a backup file, remove it */
+ unlink(oldfname);
+ /*
+ * Backup the original. Note that hard links
+ * are not supported on all filesystems.
+ */
+ if ((link(fname, oldfname) != 0) &&
+ (rename(fname, oldfname) != 0)) {
+ warn("rename()");
+ if (*tmpfname)
+ unlink(tmpfname);
+ exit(1);
+ }
+ *oldfname = '\0';
+ }
+ if (*tmpfname != '\0') {
+ if (outfile != NULL && outfile != stdout)
+ if (fclose(outfile) != 0) {
+ warn("fclose()");
+ unlink(tmpfname);
+ exit(1);
+ }
+ outfile = NULL;
+ if (rename(tmpfname, fname) != 0) {
+ /* this should not happen really! */
+ warn("rename()");
+ unlink(tmpfname);
+ exit(1);
+ }
+ *tmpfname = '\0';
+ }
+ outfname = NULL;
+ }
+ if (firstfile == 0)
+ files = files->next;
+ else
+ firstfile = 0;
+ if (files == NULL) {
+ sp->len = 0;
+ return (0);
+ }
+ fname = files->fname;
+ if (inplace != NULL) {
+ if (lstat(fname, &sb) != 0)
+ err(1, "%s", fname);
+ if (!(sb.st_mode & S_IFREG))
+ errx(1, "%s: %s %s", fname,
+ "in-place editing only",
+ "works for regular files");
+ if (*inplace != '\0') {
+ strlcpy(oldfname, fname,
+ sizeof(oldfname));
+ len = strlcat(oldfname, inplace,
+ sizeof(oldfname));
+ if (len > sizeof(oldfname))
+ errx(1, "%s: name too long", fname);
+ }
+ char d_name[PATH_MAX], f_name[PATH_MAX];
+ (void)strlcpy(d_name, fname, sizeof(d_name));
+ (void)strlcpy(f_name, fname, sizeof(f_name));
+ len = (size_t)snprintf(tmpfname, sizeof(tmpfname),
+ "%s/.!%ld!%s", dirname(d_name), (long)getpid(),
+ basename(f_name));
+ if (len >= sizeof(tmpfname))
+ errx(1, "%s: name too long", fname);
+ unlink(tmpfname);
+ if (outfile != NULL && outfile != stdout)
+ fclose(outfile);
+ if ((outfile = fopen(tmpfname, "w")) == NULL)
+ err(1, "%s", fname);
+ fchown(fileno(outfile), sb.st_uid, sb.st_gid);
+ fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
+ outfname = tmpfname;
+ if (!ispan) {
+ linenum = 0;
+ resetstate();
+ }
+ } else {
+ outfile = stdout;
+ outfname = "stdout";
+ }
+ if ((infile = fopen(fname, "r")) == NULL) {
+ warn("%s", fname);
+ rval = 1;
+ continue;
+ }
+ }
+ /*
+ * We are here only when infile is open and we still have something
+ * to read from it.
+ *
+ * Use getline() so that we can handle essentially infinite input
+ * data. The p and plen are static so each invocation gives
+ * getline() the same buffer which is expanded as needed.
+ */
+ ssize_t slen = getline(&p, &plen, infile);
+ if (slen == -1)
+ err(1, "%s", fname);
+ if (slen != 0 && p[slen - 1] == '\n')
+ slen--;
+ cspace(sp, p, (size_t)slen, spflag);
+
+ linenum++;
+
+ return (1);
+}
+
+static int
+lastline(void)
+{
+ int ch;
+
+ if (files->next != NULL && (inplace == NULL || ispan))
+ return (0);
+ if ((ch = getc(infile)) == EOF)
+ return (1);
+ ungetc(ch, infile);
+ return (0);
+}
