minix/commands/ash/mkinit.c
2005-04-21 14:53:53 +00:00

547 lines
11 KiB
C
Executable file

/*-
* Copyright (c) 1991 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1991 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)mkinit.c 5.3 (Berkeley) 3/13/91";
#endif /* not lint */
/*
* This program scans all the source files for code to handle various
* special events and combines this code into one file. This (allegedly)
* improves the structure of the program since there is no need for
* anyone outside of a module to know that that module performs special
* operations on particular events. The command is executed iff init.c
* is actually changed.
*
* Usage: mkinit command sourcefile...
*/
#include <sys/cdefs.h>
#include <sys/types.h>
#include <stdio.h>
#include <fcntl.h>
/*
* OUTFILE is the name of the output file. Output is initially written
* to the file OUTTEMP, which is then moved to OUTFILE if OUTTEMP and
* OUTFILE are different.
*/
#define OUTFILE "init.c"
#define OUTTEMP "init.c.new"
#define OUTOBJ "init.o"
/*
* A text structure is basicly just a string that grows as more characters
* are added onto the end of it. It is implemented as a linked list of
* blocks of characters. The routines addstr and addchar append a string
* or a single character, respectively, to a text structure. Writetext
* writes the contents of a text structure to a file.
*/
#define BLOCKSIZE 512
struct text {
char *nextc;
int nleft;
struct block *start;
struct block *last;
};
struct block {
struct block *next;
char text[BLOCKSIZE];
};
/*
* There is one event structure for each event that mkinit handles.
*/
struct event {
char *name; /* name of event (e.g. INIT) */
char *routine; /* name of routine called on event */
char *comment; /* comment describing routine */
struct text code; /* code for handling event */
};
char writer[] = "\
/*\n\
* This file was generated by the mkinit program.\n\
*/\n\
\n";
char init[] = "\
/*\n\
* Initialization code.\n\
*/\n";
char reset[] = "\
/*\n\
* This routine is called when an error or an interrupt occurs in an\n\
* interactive shell and control is returned to the main command loop.\n\
*/\n";
char shellproc[] = "\
/*\n\
* This routine is called to initialize the shell to run a shell procedure.\n\
*/\n";
struct event event[] = {
{"INIT", "init", init},
{"RESET", "reset", reset},
{"SHELLPROC", "initshellproc", shellproc},
{NULL, NULL}
};
char *curfile; /* current file */
int linno; /* current line */
char *header_files[200]; /* list of header files */
struct text defines; /* #define statements */
struct text decls; /* declarations */
int amiddecls; /* for formatting */
void readfile(), doevent(), doinclude(), dodecl(), output();
void addstr(), addchar(), writetext();
#define equal(s1, s2) (strcmp(s1, s2) == 0)
FILE *ckfopen();
char *savestr();
void *ckmalloc __P((int));
void error();
main(argc, argv)
char **argv;
{
char **ap;
int fd;
char c;
if (argc < 2)
error("Usage: mkinit command file...");
header_files[0] = "\"shell.h\"";
header_files[1] = "\"mystring.h\"";
for (ap = argv + 2 ; *ap ; ap++)
readfile(*ap);
output();
if (file_changed()) {
unlink(OUTFILE);
link(OUTTEMP, OUTFILE);
unlink(OUTTEMP);
} else {
unlink(OUTTEMP);
if (touch(OUTOBJ))
exit(0); /* no compilation necessary */
}
printf("%s\n", argv[1]);
execl("/bin/sh", "sh", "-c", argv[1], (char *)0);
error("Can't exec shell");
}
/*
* Parse an input file.
*/
void
readfile(fname)
char *fname;
{
FILE *fp;
char line[1024];
struct event *ep;
fp = ckfopen(fname, "r");
curfile = fname;
linno = 0;
amiddecls = 0;
while (fgets(line, sizeof line, fp) != NULL) {
linno++;
for (ep = event ; ep->name ; ep++) {
if (line[0] == ep->name[0] && match(ep->name, line)) {
doevent(ep, fp, fname);
break;
}
}
if (line[0] == 'I' && match("INCLUDE", line))
doinclude(line);
if (line[0] == 'M' && match("MKINIT", line))
dodecl(line, fp);
if (line[0] == '#' && gooddefine(line))
addstr(line, &defines);
}
fclose(fp);
}
int
match(name, line)
char *name;
char *line;
{
register char *p, *q;
p = name, q = line;
while (*p) {
if (*p++ != *q++)
return 0;
}
if (*q != '{' && *q != ' ' && *q != '\t' && *q != '\n')
return 0;
return 1;
}
int
gooddefine(line)
char *line;
{
register char *p;
if (! match("#define", line))
return 0; /* not a define */
p = line + 7;
while (*p == ' ' || *p == '\t')
p++;
while (*p != ' ' && *p != '\t') {
if (*p == '(')
return 0; /* macro definition */
p++;
}
while (*p != '\n' && *p != '\0')
p++;
if (p[-1] == '\\')
return 0; /* multi-line definition */
return 1;
}
void
doevent(ep, fp, fname)
register struct event *ep;
FILE *fp;
char *fname;
{
char line[1024];
int indent;
char *p;
sprintf(line, "\n /* from %s: */\n", fname);
addstr(line, &ep->code);
addstr(" {\n", &ep->code);
for (;;) {
linno++;
if (fgets(line, sizeof line, fp) == NULL)
error("Unexpected EOF");
if (equal(line, "}\n"))
break;
indent = 6;
for (p = line ; *p == '\t' ; p++)
indent += 8;
for ( ; *p == ' ' ; p++)
indent++;
if (*p == '\n' || *p == '#')
indent = 0;
while (indent >= 8) {
addchar('\t', &ep->code);
indent -= 8;
}
while (indent > 0) {
addchar(' ', &ep->code);
indent--;
}
addstr(p, &ep->code);
}
addstr(" }\n", &ep->code);
}
void
doinclude(line)
char *line;
{
register char *p;
char *name;
register char **pp;
for (p = line ; *p != '"' && *p != '<' && *p != '\0' ; p++);
if (*p == '\0')
error("Expecting '\"' or '<'");
name = p;
while (*p != ' ' && *p != '\t' && *p != '\n')
p++;
if (p[-1] != '"' && p[-1] != '>')
error("Missing terminator");
*p = '\0';
/* name now contains the name of the include file */
for (pp = header_files ; *pp && ! equal(*pp, name) ; pp++);
if (*pp == NULL)
*pp = savestr(name);
}
void
dodecl(line1, fp)
char *line1;
FILE *fp;
{
char line[1024];
register char *p, *q;
if (strcmp(line1, "MKINIT\n") == 0) { /* start of struct/union decl */
addchar('\n', &decls);
do {
linno++;
if (fgets(line, sizeof line, fp) == NULL)
error("Unterminated structure declaration");
addstr(line, &decls);
} while (line[0] != '}');
amiddecls = 0;
} else {
if (! amiddecls)
addchar('\n', &decls);
q = NULL;
for (p = line1 + 6 ; *p != '=' && *p != '/' ; p++);
if (*p == '=') { /* eliminate initialization */
for (q = p ; *q && *q != ';' ; q++);
if (*q == '\0')
q = NULL;
else {
while (p[-1] == ' ')
p--;
*p = '\0';
}
}
addstr("extern", &decls);
addstr(line1 + 6, &decls);
if (q != NULL)
addstr(q, &decls);
amiddecls = 1;
}
}
/*
* Write the output to the file OUTTEMP.
*/
void
output() {
FILE *fp;
char **pp;
struct event *ep;
fp = ckfopen(OUTTEMP, "w");
fputs(writer, fp);
for (pp = header_files ; *pp ; pp++)
fprintf(fp, "#include %s\n", *pp);
fputs("\n\n\n", fp);
writetext(&defines, fp);
fputs("\n\n", fp);
writetext(&decls, fp);
for (ep = event ; ep->name ; ep++) {
fputs("\n\n\n", fp);
fputs(ep->comment, fp);
fprintf(fp, "\nvoid\n%s() {\n", ep->routine);
writetext(&ep->code, fp);
fprintf(fp, "}\n");
}
fclose(fp);
}
/*
* Return true if the new output file is different from the old one.
*/
int
file_changed() {
register FILE *f1, *f2;
register int c;
if ((f1 = fopen(OUTFILE, "r")) == NULL
|| (f2 = fopen(OUTTEMP, "r")) == NULL)
return 1;
while ((c = getc(f1)) == getc(f2)) {
if (c == EOF)
return 0;
}
return 1;
}
/*
* Touch a file. Returns 0 on failure, 1 on success.
*/
int
touch(file)
char *file;
{
int fd;
char c;
if ((fd = open(file, O_RDWR)) < 0)
return 0;
if (read(fd, &c, 1) != 1) {
close(fd);
return 0;
}
lseek(fd, 0L, 0);
write(fd, &c, 1);
close(fd);
return 1;
}
/*
* A text structure is simply a block of text that is kept in memory.
* Addstr appends a string to the text struct, and addchar appends a single
* character.
*/
void
addstr(s, text)
register char *s;
register struct text *text;
{
while (*s) {
if (--text->nleft < 0)
addchar(*s++, text);
else
*text->nextc++ = *s++;
}
}
void
addchar(c, text)
register struct text *text;
{
struct block *bp;
if (--text->nleft < 0) {
bp = ckmalloc(sizeof *bp);
if (text->start == NULL)
text->start = bp;
else
text->last->next = bp;
text->last = bp;
text->nextc = bp->text;
text->nleft = BLOCKSIZE - 1;
}
*text->nextc++ = c;
}
/*
* Write the contents of a text structure to a file.
*/
void
writetext(text, fp)
struct text *text;
FILE *fp;
{
struct block *bp;
if (text->start != NULL) {
for (bp = text->start ; bp != text->last ; bp = bp->next)
fwrite(bp->text, sizeof (char), BLOCKSIZE, fp);
fwrite(bp->text, sizeof (char), BLOCKSIZE - text->nleft, fp);
}
}
FILE *
ckfopen(file, mode)
char *file;
char *mode;
{
FILE *fp;
if ((fp = fopen(file, mode)) == NULL) {
fprintf(stderr, "Can't open %s\n", file);
exit(2);
}
return fp;
}
void *
ckmalloc(nbytes) {
register char *p;
char *malloc();
if ((p = malloc(nbytes)) == NULL)
error("Out of space");
return p;
}
char *
savestr(s)
char *s;
{
register char *p;
p = ckmalloc(strlen(s) + 1);
strcpy(p, s);
return p;
}
void
error(msg)
char *msg;
{
if (curfile != NULL)
fprintf(stderr, "%s:%d: ", curfile, linno);
fprintf(stderr, "%s\n", msg);
exit(2);
}