424 lines
11 KiB
C
424 lines
11 KiB
C
/*
|
|
* serv.c
|
|
* Facility: m4 macro processor
|
|
* by: oz
|
|
*/
|
|
|
|
#include "mdef.h"
|
|
#include "extr.h"
|
|
|
|
char *dumpfmt = "`%s'\t`%s'\n"; /* format string for dumpdef */
|
|
|
|
/*
|
|
* expand - user-defined macro expansion
|
|
*
|
|
*/
|
|
void expand(argv, argc)
|
|
register char *argv[];
|
|
register int argc;
|
|
{
|
|
register char *t;
|
|
register char *p;
|
|
register int n;
|
|
register int argno;
|
|
|
|
t = argv[0]; /* defn string as a whole */
|
|
p = t;
|
|
while (*p)
|
|
p++;
|
|
p--; /* last character of defn */
|
|
while (p > t) {
|
|
if (*(p-1) != ARGFLAG)
|
|
putback(*p);
|
|
else {
|
|
switch (*p) {
|
|
|
|
case '#':
|
|
pbnum(argc-2);
|
|
break;
|
|
case '0':
|
|
case '1':
|
|
case '2':
|
|
case '3':
|
|
case '4':
|
|
case '5':
|
|
case '6':
|
|
case '7':
|
|
case '8':
|
|
case '9':
|
|
if ((argno = *p - '0') < argc-1)
|
|
pbstr(argv[argno+1]);
|
|
break;
|
|
case '*':
|
|
for (n = argc - 1; n > 2; n--) {
|
|
pbstr(argv[n]);
|
|
putback(',');
|
|
}
|
|
pbstr(argv[2]);
|
|
break;
|
|
default :
|
|
putback(*p);
|
|
break;
|
|
}
|
|
p--;
|
|
}
|
|
p--;
|
|
}
|
|
if (p == t) /* do last character */
|
|
putback(*p);
|
|
}
|
|
|
|
/*
|
|
* dodefine - install definition in the table
|
|
*
|
|
*/
|
|
void dodefine(name, defn)
|
|
register char *name;
|
|
register char *defn;
|
|
{
|
|
register ndptr p;
|
|
|
|
if (!*name)
|
|
error("m4: null definition.");
|
|
if (strcmp(name, defn) == 0)
|
|
error("m4: recursive definition.");
|
|
if ((p = lookup(name)) == nil)
|
|
p = addent(name);
|
|
else if (p->defn != null)
|
|
free(p->defn);
|
|
if (!*defn)
|
|
p->defn = null;
|
|
else
|
|
p->defn = strsave(defn);
|
|
p->type = MACRTYPE;
|
|
}
|
|
|
|
/*
|
|
* dodefn - push back a quoted definition of
|
|
* the given name.
|
|
*/
|
|
|
|
void dodefn(name)
|
|
char *name;
|
|
{
|
|
register ndptr p;
|
|
|
|
if ((p = lookup(name)) != nil && p->defn != null) {
|
|
putback(rquote);
|
|
pbstr(p->defn);
|
|
putback(lquote);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* dopushdef - install a definition in the hash table
|
|
* without removing a previous definition. Since
|
|
* each new entry is entered in *front* of the
|
|
* hash bucket, it hides a previous definition from
|
|
* lookup.
|
|
*/
|
|
void dopushdef(name, defn)
|
|
register char *name;
|
|
register char *defn;
|
|
{
|
|
register ndptr p;
|
|
|
|
if (!*name)
|
|
error("m4: null definition");
|
|
if (strcmp(name, defn) == 0)
|
|
error("m4: recursive definition.");
|
|
p = addent(name);
|
|
if (!*defn)
|
|
p->defn = null;
|
|
else
|
|
p->defn = strsave(defn);
|
|
p->type = MACRTYPE;
|
|
}
|
|
|
|
/*
|
|
* dodumpdef - dump the specified definitions in the hash
|
|
* table to stderr. If nothing is specified, the entire
|
|
* hash table is dumped.
|
|
*
|
|
*/
|
|
void dodump(argv, argc)
|
|
register char *argv[];
|
|
register int argc;
|
|
{
|
|
register int n;
|
|
ndptr p;
|
|
|
|
if (argc > 2) {
|
|
for (n = 2; n < argc; n++)
|
|
if ((p = lookup(argv[n])) != nil)
|
|
fprintf(stderr, dumpfmt, p->name,
|
|
p->defn);
|
|
}
|
|
else {
|
|
for (n = 0; n < HASHSIZE; n++)
|
|
for (p = hashtab[n]; p != nil; p = p->nxtptr)
|
|
fprintf(stderr, dumpfmt, p->name,
|
|
p->defn);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* doifelse - select one of two alternatives - loop.
|
|
*
|
|
*/
|
|
void doifelse(argv,argc)
|
|
register char *argv[];
|
|
register int argc;
|
|
{
|
|
cycle {
|
|
if (strcmp(argv[2], argv[3]) == 0)
|
|
pbstr(argv[4]);
|
|
else if (argc == 6)
|
|
pbstr(argv[5]);
|
|
else if (argc > 6) {
|
|
argv += 3;
|
|
argc -= 3;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* doinclude - include a given file.
|
|
*
|
|
*/
|
|
int doincl(ifile)
|
|
char *ifile;
|
|
{
|
|
if (ilevel+1 == MAXINP)
|
|
error("m4: too many include files.");
|
|
if ((infile[ilevel+1] = fopen(ifile, "r")) != NULL) {
|
|
ilevel++;
|
|
return (1);
|
|
}
|
|
else
|
|
return (0);
|
|
}
|
|
|
|
#ifdef EXTENDED
|
|
/*
|
|
* dopaste - include a given file without any
|
|
* macro processing.
|
|
*/
|
|
int dopaste(pfile)
|
|
char *pfile;
|
|
{
|
|
FILE *pf;
|
|
register int c;
|
|
|
|
if ((pf = fopen(pfile, "r")) != NULL) {
|
|
while((c = getc(pf)) != EOF)
|
|
putc(c, active);
|
|
(void) fclose(pf);
|
|
return(1);
|
|
}
|
|
else
|
|
return(0);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* dochq - change quote characters
|
|
*
|
|
*/
|
|
void dochq(argv, argc)
|
|
register char *argv[];
|
|
register int argc;
|
|
{
|
|
if (argc > 2) {
|
|
if (*argv[2])
|
|
lquote = *argv[2];
|
|
if (argc > 3) {
|
|
if (*argv[3])
|
|
rquote = *argv[3];
|
|
}
|
|
else
|
|
rquote = lquote;
|
|
}
|
|
else {
|
|
lquote = LQUOTE;
|
|
rquote = RQUOTE;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* dochc - change comment characters
|
|
*
|
|
*/
|
|
void dochc(argv, argc)
|
|
register char *argv[];
|
|
register int argc;
|
|
{
|
|
if (argc > 2) {
|
|
if (*argv[2])
|
|
scommt = *argv[2];
|
|
if (argc > 3) {
|
|
if (*argv[3])
|
|
ecommt = *argv[3];
|
|
}
|
|
else
|
|
ecommt = ECOMMT;
|
|
}
|
|
else {
|
|
scommt = SCOMMT;
|
|
ecommt = ECOMMT;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* dodivert - divert the output to a temporary file
|
|
*
|
|
*/
|
|
void dodiv(n)
|
|
register int n;
|
|
{
|
|
if (n < 0 || n >= MAXOUT)
|
|
n = 0; /* bitbucket */
|
|
if (outfile[n] == NULL) {
|
|
m4temp[UNIQUE] = n + '0';
|
|
if ((outfile[n] = fopen(m4temp, "w")) == NULL)
|
|
error("m4: cannot divert.");
|
|
}
|
|
oindex = n;
|
|
active = outfile[n];
|
|
}
|
|
|
|
/*
|
|
* doundivert - undivert a specified output, or all
|
|
* other outputs, in numerical order.
|
|
*/
|
|
void doundiv(argv, argc)
|
|
register char *argv[];
|
|
register int argc;
|
|
{
|
|
register int ind;
|
|
register int n;
|
|
|
|
if (argc > 2) {
|
|
for (ind = 2; ind < argc; ind++) {
|
|
n = atoi(argv[ind]);
|
|
if (n > 0 && n < MAXOUT && outfile[n] != NULL)
|
|
getdiv(n);
|
|
|
|
}
|
|
}
|
|
else
|
|
for (n = 1; n < MAXOUT; n++)
|
|
if (outfile[n] != NULL)
|
|
getdiv(n);
|
|
}
|
|
|
|
/*
|
|
* dosub - select substring
|
|
*
|
|
*/
|
|
void dosub (argv, argc)
|
|
register char *argv[];
|
|
register int argc;
|
|
{
|
|
register char *ap, *fc, *k;
|
|
register int nc;
|
|
|
|
if (argc < 5)
|
|
nc = MAXTOK;
|
|
else
|
|
#ifdef EXPR
|
|
nc = expr(argv[4]);
|
|
#else
|
|
nc = atoi(argv[4]);
|
|
#endif
|
|
ap = argv[2]; /* target string */
|
|
#ifdef EXPR
|
|
fc = ap + expr(argv[3]); /* first char */
|
|
#else
|
|
fc = ap + atoi(argv[3]); /* first char */
|
|
#endif
|
|
if (fc >= ap && fc < ap+strlen(ap))
|
|
for (k = fc+min(nc,strlen(fc))-1; k >= fc; k--)
|
|
putback(*k);
|
|
}
|
|
|
|
/*
|
|
* map:
|
|
* map every character of s1 that is specified in from
|
|
* into s3 and replace in s. (source s1 remains untouched)
|
|
*
|
|
* This is a standard implementation of map(s,from,to) function of ICON
|
|
* language. Within mapvec, we replace every character of "from" with
|
|
* the corresponding character in "to". If "to" is shorter than "from",
|
|
* than the corresponding entries are null, which means that those
|
|
* characters dissapear altogether. Furthermore, imagine
|
|
* map(dest, "sourcestring", "srtin", "rn..*") type call. In this case,
|
|
* `s' maps to `r', `r' maps to `n' and `n' maps to `*'. Thus, `s'
|
|
* ultimately maps to `*'. In order to achieve this effect in an efficient
|
|
* manner (i.e. without multiple passes over the destination string), we
|
|
* loop over mapvec, starting with the initial source character. if the
|
|
* character value (dch) in this location is different than the source
|
|
* character (sch), sch becomes dch, once again to index into mapvec, until
|
|
* the character value stabilizes (i.e. sch = dch, in other words
|
|
* mapvec[n] == n). Even if the entry in the mapvec is null for an ordinary
|
|
* character, it will stabilize, since mapvec[0] == 0 at all times. At the
|
|
* end, we restore mapvec* back to normal where mapvec[n] == n for
|
|
* 0 <= n <= 127. This strategy, along with the restoration of mapvec, is
|
|
* about 5 times faster than any algorithm that makes multiple passes over
|
|
* destination string.
|
|
*
|
|
*/
|
|
|
|
void map(dest,src,from,to)
|
|
register char *dest;
|
|
register char *src;
|
|
register char *from;
|
|
register char *to;
|
|
{
|
|
register char *tmp;
|
|
register char sch, dch;
|
|
static char mapvec[128] = {
|
|
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
|
|
12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
|
|
24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
|
|
36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
|
|
48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59,
|
|
60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71,
|
|
72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83,
|
|
84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
|
|
96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107,
|
|
108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119,
|
|
120, 121, 122, 123, 124, 125, 126, 127
|
|
};
|
|
|
|
if (*src) {
|
|
tmp = from;
|
|
/*
|
|
* create a mapping between "from" and "to"
|
|
*/
|
|
while (*from)
|
|
mapvec[*from++] = (*to) ? *to++ : (char) 0;
|
|
|
|
while (*src) {
|
|
sch = *src++;
|
|
dch = mapvec[sch];
|
|
while (dch != sch) {
|
|
sch = dch;
|
|
dch = mapvec[sch];
|
|
}
|
|
if (*dest = dch)
|
|
dest++;
|
|
}
|
|
/*
|
|
* restore all the changed characters
|
|
*/
|
|
while (*tmp) {
|
|
mapvec[*tmp] = *tmp;
|
|
tmp++;
|
|
}
|
|
}
|
|
*dest = (char) 0;
|
|
}
|