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- /*
- * $XConsortium: parse.c,v 1.10 89/06/13 19:15:37 jim Exp $
- *
- * Edit history
- * Updated: MJF 07-Dec-90 -- Added support for evaluation of #if
- *
- */
- #include "def.h"
-
- extern char *directives[];
- extern struct symtab deflist[];
-
- find_includes(filep, file, file_red, recursion)
- struct filepointer *filep;
- struct inclist *file, *file_red;
- int recursion;
- {
- register char *line;
- register int type;
-
- while (line = getline(filep)) {
- switch(type = deftype(line, filep, file_red, file, TRUE)) {
- case IF:
- doif:
- type = find_includes(filep, file,
- file_red, recursion+1);
- while ((type == ELIF) || (type == ELIFFALSE))
- type = gobble(filep, file, file_red);
- if (type == ELSE)
- gobble(filep, file, file_red);
- break;
- case IFFALSE:
- doiffalse:
- type = gobble(filep, file, file_red);
- if (type == ELSE)
- find_includes(filep, file,
- file_red, recursion+1);
- else
- if (type == ELIF)
- goto doif;
- else
- if (type == ELIFFALSE)
- goto doiffalse;
- break;
- case IFDEF:
- case IFNDEF:
- if ((type == IFDEF && defined(line, file_red))
- || (type == IFNDEF && !defined(line, file_red))) {
- debug1(type == IFNDEF ?
- "line %d: %s !def'd in %s via %s%s\n" : "",
- filep->f_line, line,
- file->i_file, file_red->i_file, ": doit");
- type = find_includes(filep, file,
- file_red, recursion+1);
- if (type == ELSE)
- gobble(filep, file, file_red);
- }
- else {
- debug1(type == IFDEF ?
- "line %d: %s !def'd in %s via %s%s\n" : "",
- filep->f_line, line,
- file->i_file, file_red->i_file, ": gobble");
- type = gobble(filep, file, file_red);
- if (type == ELSE)
- find_includes(filep, file,
- file_red, recursion+1);
- }
- break;
- case ELSE:
- case ELIFFALSE:
- case ELIF:
- if (!recursion)
- gobble(filep, file, file_red);
- case ENDIF:
- if (recursion)
- return(type);
- case DEFINE:
- define(line, file);
- break;
- case UNDEF:
- /*
- * undefine all occurances of line by killing s_name
- */
- if (!*line) {
- do_log("%s, line %d: incomplete undef == \"%s\"\n",
- file_red->i_file, filep->f_line, line);
- break;
- }
- {
- struct symtab *val;
- for(val = defined(line, file_red);
- (val && val->s_name);
- val = defined(line, file_red))
-
- *(val->s_name) = '\0';
- }
- break;
- case INCLUDE:
- add_include(file, file_red, line, FALSE);
- break;
- case INCLUDEDOT:
- add_include(file, file_red, line, TRUE);
- break;
- case PRAGMA:
- case ERROR:
- case IDENT:
- case SCCS:
- case EJECT:
- break;
- case -1:
- do_log("%s\n", file_red->i_file);
- if (file_red != file)
- do_log(" (reading %s)\n", file->i_file);
- do_log(", line %d: unknown directive == \"%s\"\n",
- filep->f_line, line);
- break;
- case -2:
- do_log("%s\n", file_red->i_file);
- if (file_red != file)
- do_log(" (reading %s)\n", file->i_file);
- do_log(", line %d: incomplete include == \"%s\"\n",
- filep->f_line, line);
- break;
- }
- }
- return(-1);
- }
-
- gobble(filep, file, file_red)
- register struct filepointer *filep;
- struct inclist *file, *file_red;
- {
- register char *line;
- register int type;
-
- while (line = getline(filep)) {
- switch(type = deftype(line, filep, file_red, file, FALSE)) {
- case IF:
- case IFFALSE:
- case IFDEF:
- case IFNDEF:
- type = gobble(filep, file, file_red);
- while ((type == ELIF) || (type == ELIFFALSE))
- type = gobble(filep, file, file_red);
- if (type == ELSE)
- type = gobble(filep, file, file_red);
- break;
- case ELSE:
- case ENDIF:
- debug0("%s, line %d: #%s\n",
- file->i_file, filep->f_line,
- directives[type]);
- return(type);
- case DEFINE:
- case UNDEF:
- case INCLUDE:
- case INCLUDEDOT:
- case PRAGMA:
- case ERROR:
- case IDENT:
- case SCCS:
- case EJECT:
- break;
- case ELIF:
- case ELIFFALSE:
- return(type);
- case -1:
- do_log("%s, line %d: unknown directive == \"%s\"\n",
- file_red->i_file, filep->f_line, line);
- break;
- }
- }
- return(-1);
- }
-
- /*
- * Decide what type of # directive this line is.
- */
- deftype(line, filep, file_red, file, parse_it)
- register char *line;
- register struct filepointer *filep;
- register struct inclist *file_red, *file;
- int parse_it;
- {
- register char *p;
- char *directive, savechar;
- register int ret;
-
- /*
- * Parse the directive...
- */
- directive=line+1;
- while (*directive == ' ' || *directive == '\t')
- directive++;
-
- p = directive;
- while (*p >= 'a' && *p <= 'z')
- p++;
- savechar = *p;
- *p = '\0';
- ret = match(directive, directives);
- *p = savechar;
-
- /* If we don't recognize this compiler directive or we happen to just
- * be gobbling up text while waiting for an #endif or #elif or #else
- * in the case of an #elif we must check the zero_value and return an
- * ELIF or an ELIFFALSE.
- */
-
- if (ret == ELIF && !parse_it)
- {
- while (*p == ' ' || *p == '\t')
- p++;
- /*
- * parse an expression.
- */
- debug0("%s, line %d: #elif %s ",
- file->i_file, filep->f_line, p);
- if (zero_value(p, filep, file_red))
- {
- debug0("false...\n");
- return(ELIFFALSE);
- }
- else
- {
- debug0("true...\n");
- return(ret);
- }
- }
-
- if (ret < 0 || ! parse_it)
- return(ret);
-
- /*
- * now decide how to parse the directive, and do it.
- */
- while (*p == ' ' || *p == '\t')
- p++;
- switch (ret) {
- case IF:
- /*
- * parse an expression.
- */
- debug0("%s, line %d: #if %s\n",
- file->i_file, filep->f_line, p);
- if (zero_value(p, filep, file_red))
- ret = IFFALSE;
- break;
- case IFDEF:
- case IFNDEF:
- debug0("%s, line %d: #%s %s\n",
- file->i_file, filep->f_line, directives[ret], p);
- case UNDEF:
- /*
- * separate the name of a single symbol.
- */
- while (isalnum(*p) || *p == '_')
- *line++ = *p++;
- *line = '\0';
- break;
- case INCLUDE:
- #ifdef VMS
- /* Take care of some VMS sloppiness - in the file stdio.h, the
- * following two lines occur (without " or <):
- * # include stddef
- * # include stdarg
- */
- {char *find = p;
- int found = 0;
- while (*find) {
- if (*find == '"' || *find == '<') {
- found = 1;
- break;
- }
- ++find;
- }
- if (! found) {
- /* This is indeed a case of sloppiness */
- char s[200];
- sscanf (p, "%s", s);
- /* add "" around file name, as well as the .h extension */
- sprintf (p, "\"%s.h\"", s);
- }
- }
- #endif
- debug2("%s, line %d: #include %s\n",
- file->i_file, filep->f_line, p);
-
- /* Support ANSI macro substitution */
- {
- struct symtab *sym = defined(p, file_red);
- while (sym) {
- p = sym->s_value;
- debug3("%s : #includes SYMBOL %s = %s\n",
- file->i_incstring,
- sym -> s_name,
- sym -> s_value);
- /* mark file as having included a 'soft include' */
- file->i_included_sym = TRUE;
- sym = defined(p, file_red);
- }
- }
-
- /*
- * Separate the name of the include file.
- */
- while (*p && *p != '"' && *p != '<')
- p++;
- if (! *p)
- return(-2);
- if (*p++ == '"') {
- ret = INCLUDEDOT;
- while (*p && *p != '"')
- *line++ = *p++;
- } else
- while (*p && *p != '>')
- *line++ = *p++;
- *line = '\0';
- break;
- case DEFINE:
- /*
- * copy the definition back to the beginning of the line.
- */
- strcpy (line, p);
- break;
- case ELSE:
- case ENDIF:
- case ELIF:
- case PRAGMA:
- case ERROR:
- case IDENT:
- case SCCS:
- case EJECT:
- debug0("%s, line %d: #%s\n",
- file->i_file, filep->f_line, directives[ret]);
- /*
- * nothing to do.
- */
- break;
- }
- return(ret);
- }
-
- struct symtab *defined(symbol, file)
- register char *symbol;
- struct inclist *file;
- {
- register struct symtab *val;
-
- if (val = slookup(symbol, deflist)) {
- debug1("%s defined on command line\n", symbol);
- return(val);
- }
- if (val = fdefined(symbol, file))
- return(val);
- debug1("%s not defined in %s\n", symbol, file->i_file);
- return(NULL);
- }
-
- struct symtab *fdefined(symbol, file)
- register char *symbol;
- struct inclist *file;
- {
- register struct inclist **ip;
- register struct symtab *val;
- register int i;
- static int recurse_lvl = 0;
-
- if (file->i_defchecked)
- return(NULL);
- file->i_defchecked = TRUE;
- if (val = slookup(symbol, file->i_defs))
- debug1("%s defined in %s\n", symbol, file->i_file);
- if (val == NULL && file->i_list)
- for (ip = file->i_list, i=0; i < file->i_listlen; i++, ip++)
- if (val = fdefined(symbol, *ip)) {
- debug1("%s defined in %s\n",
- symbol, (*ip)->i_file);
- break;
- }
- recurse_lvl--;
- file->i_defchecked = FALSE;
-
- return(val);
- }
-
- struct symtab *slookup(symbol, stab)
- register char *symbol;
- register struct symtab *stab;
- {
- if (stab)
- for (; stab->s_name; stab++)
- if (strcmp(symbol, stab->s_name) == 0)
- return(stab);
- return(NULL);
- }
-
- /*
- * Return true if the #if expression evaluates to 0
- */
- extern char* if_expr;
-
- zero_value(exp, filep, file_red)
- register char *exp;
- register struct filepointer *filep;
- register struct inclist *file_red;
- {
- #ifdef CPP
- return (cppsetup(exp, filep, file_red) == 0);
- #else
- if_expr = exp;
- return(eval()==0);
- #endif /* CPP */
- }
-
- define(def, file)
- register char *def;
- register struct inclist *file;
- {
- register char *p;
- struct symtab *sp = file->i_lastdef++;
- register int i;
-
- /*
- * If we are out of space, allocate some more.
- */
- if (file->i_defs == NULL
- || file->i_lastdef == file->i_defs + file->i_deflen) {
- if (file->i_defs)
- file->i_defs = (struct symtab *) realloc(file->i_defs,
- sizeof(struct symtab)*(file->i_deflen+SYMTABINC));
- else
- file->i_defs = (struct symtab *)
- malloc(sizeof (struct symtab) * SYMTABINC);
- i=file->i_deflen;
- file->i_deflen += SYMTABINC;
- while (i < file->i_deflen)
- file->i_defs[ i++ ].s_name = NULL;
- file->i_lastdef = file->i_defs + file->i_deflen - SYMTABINC;
- if (sp) /* be sure we use last cell in previous group */
- file->i_lastdef--;
- sp = file->i_lastdef++;
- }
- else if (file->i_lastdef > file->i_defs + file->i_deflen)
- log_fatal("define() botch\n");
-
- /*
- * copy the symbol being defined.
- */
- p = def;
- while (isalnum(*p) || *p == '_')
- p++;
- if (*p)
- *p++ = '\0';
- sp->s_name = copy(def);
-
- /*
- * And copy its value.
- */
- while (*p == ' ' && *p == '\t')
- p++;
- sp->s_value = copy(p);
- }
-