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