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vms-pp.c
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C/C++ Source or Header
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1992-08-04
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7KB
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243 lines
/* vms_pp - preprocess emacs files in such a way that they can be
* compiled on VMS without warnings.
* Copyright (C) 1986 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Usage:
* vms_pp infile outfile
* implicit inputs:
* The file "vms_pp.trans" has the names and their translations.
* description:
* Vms_pp takes the input file and scans it, replacing the long
* names with shorter names according to the table read in from
* vms_pp.trans. The line is then written to the output file.
*
* Additionally, the "#undef foo" construct is replaced with:
* #ifdef foo
* #undef foo
* #endif
*
* The construct #if defined(foo) is replaced with
* #ifdef foo
* #define foo_VAL 1
* #else
* #define foo_VAL 0
* #endif
* #define defined(XX) XX_val
* #if defined(foo)
*
* This last contruction only works on single line #if's and takes
* advantage of a questionable C pre-processor trick. If there are
* comments within the #if, that contain "defined", then this will
* bomb.
*/
#include <stdio.h>
#define Max_table 100
#define Table_name "vms_pp.trans"
#define Word_member \
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_$"
static FILE *in,*out; /* read from, write to */
struct item { /* symbol table entries */
char *name;
char *value;
};
static struct item name_table[Max_table]; /* symbol table */
static int defined_defined = 0; /* small optimization */
main(argc,argv) int argc; char **argv; {
char buffer[1024];
if(argc != 3) { /* check argument count */
fprintf(stderr,"usage: vms_pp infile outfile");
exit();
}
init_table(); /* read in translation table */
/* open input and output files
*/
if((in = fopen(argv[1],"r")) == NULL) {
fprintf(stderr,"vms_pp: unable to open file '%s'",argv[1]);
exit();
}
if((out = fopen(argv[2],"w")) == NULL) {
fprintf(stderr,"vms_pp: unable to create file '%s'",argv[2]);
exit();
}
while(fgets(buffer,1023,in) != NULL) { /* loop through buffer until end */
process_line(buffer); /* process the line */
fputs(buffer,out); /* write out the line */
}
}
/* buy - allocate and copy a string
*/
static char *buy(str) char *str; {
char *temp;
if(!(temp = malloc(strlen(str)+1))) {
fprintf(stderr,"vms_pp: can't allocate memory");
exit();
}
strcpy(temp,str);
return temp;
}
/* gather_word - return a buffer full of the next word
*/
static char *gather_word(ptr,word) char *ptr, *word;{
for(; strchr(Word_member,*ptr); ptr++,word++)
*word = *ptr;
*word = 0;
return ptr;
}
/* skip_white - skip white space
*/
static char *skip_white(ptr) char *ptr; {
while(*ptr == ' ' || *ptr == '\t')
ptr++;
return ptr;
}
/* init_table - initialize translation table.
*/
init_table() {
char buf[256],*ptr,word[128];
FILE *in;
int i;
if((in = fopen(Table_name,"r")) == NULL) { /* open file */
fprintf(stderr,"vms_pp: can't open '%s'",Table_name);
exit();
}
for(i = 0; fgets(buf,255,in) != NULL;) { /* loop through lines */
ptr = skip_white(buf);
if(*ptr == '!') /* skip comments */
continue;
ptr = gather_word(ptr,word); /* get long word */
if(*word == 0) { /* bad entry */
fprintf(stderr,"vms_pp: bad input line '%s'\n",buf);
continue;
}
name_table[i].name = buy(word); /* set up the name */
ptr = skip_white(ptr); /* skip white space */
ptr = gather_word(ptr,word); /* get equivalent name */
if(*word == 0) { /* bad entry */
fprintf(stderr,"vms_pp: bad input line '%s'\n",buf);
continue;
}
name_table[i].value = buy(word); /* and the equivalent name */
i++; /* increment to next position */
}
for(; i < Max_table; i++) /* mark rest as unused */
name_table[i].name = 0;
}
/* process_line - do actual line processing
*/
process_line(buf) char *buf; {
char *in_ptr,*out_ptr;
char word[128],*ptr;
int len;
check_pp(buf); /* check for preprocessor lines */
for(in_ptr = out_ptr = buf; *in_ptr;) {
if(!strchr(Word_member,*in_ptr)) /* non alpha-numeric? just copy */
*out_ptr++ = *in_ptr++;
else {
in_ptr = gather_word(in_ptr,word); /* get the 'word' */
if(strlen(word) > 31) /* length is too long */
replace_word(word); /* replace the word */
for(ptr = word; *ptr; ptr++,out_ptr++) /* copy out the word */
*out_ptr = *ptr;
}
}
*out_ptr = 0;
}
/* check_pp - check for preprocessor lines
*/
check_pp(buf) char *buf; {
char *ptr,*p;
char word[128];
ptr = skip_white(buf); /* skip white space */
if(*ptr != '#') /* is this a preprocessor line? */
return; /* no, just return */
ptr = skip_white(++ptr); /* skip white */
ptr = gather_word(ptr,word); /* get command word */
if(!strcmp("undef",word)) { /* undef? */
ptr = skip_white(ptr);
ptr = gather_word(ptr,word); /* get the symbol to undef */
fprintf(out,"#ifdef %s\n",word);
fputs(buf,out);
strcpy(buf,"#endif");
return;
}
if(!strcmp("if",word)) { /* check for if */
for(;;) {
ptr = strchr(ptr,'d'); /* look for d in defined */
if(!ptr) /* are we done? */
return;
if(strchr(Word_member,*(ptr-1))){ /* at beginning of word? */
ptr++; continue; /* no, continue looking */
}
ptr = gather_word(ptr,word); /* get the word */
if(strcmp(word,"defined")) /* skip if not defined */
continue;
ptr = skip_white(ptr); /* skip white */
if(*ptr != '(') /* look for open paren */
continue; /* error, continue */
ptr++; /* skip paren */
ptr = skip_white(ptr); /* more white skipping */
ptr = gather_word(ptr,word); /* get the thing to test */
if(!*word) /* null word is bad */
continue;
fprintf(out,"#ifdef %s\n",word); /* generate the code */
fprintf(out,"#define %s_VAL 1\n",word);
fprintf(out,"#else\n");
fprintf(out,"#define %s_VAL 0\n",word);
fprintf(out,"#endif\n");
if(!defined_defined) {
fprintf(out,"#define defined(XXX) XXX/**/_VAL\n");
defined_defined = 1;
}
}
}
}
/* replace_word - look the word up in the table, and replace it
* if a match is found.
*/
replace_word(word) char *word; {
int i;
for(i = 0; i < Max_table && name_table[i].name; i++)
if(!strcmp(word,name_table[i].name)) {
strcpy(word,name_table[i].value);
return;
}
fprintf(stderr,"couldn't find '%s'\n",word);
}