4.4BSD/usr/src/contrib/mh-6.8/sbr/fmtcompile.c
/* fmtcompile.c - "compile" format strings for fmtscan */
#ifndef lint
static char ident[] = "@(#)$Id: fmtcompile.c,v 1.15 1992/12/15 00:20:22 jromine Exp $";
#endif /* lint */
#include "../h/mh.h"
#include "../h/addrsbr.h"
#include "../h/formatsbr.h"
#include "../zotnet/tws.h"
#include "../h/fmtcompile.h"
#include <ctype.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
static struct format *formatvec; /* array to hold formats */
static struct format *next_fp; /* next free format slot */
static struct format *fp; /* current format slot */
static struct comp *cm; /* most recent comp ref */
static struct ftable *ftbl; /* most recent func ref */
static int ncomp;
static int infunction; /* function nesting cnt */
extern char *getusr();
extern struct mailname fmt_mnull;
struct ftable {
char *name; /* function name */
char type; /* argument type */
#define TF_COMP 0 /* component expected */
#define TF_NUM 1 /* number expected */
#define TF_STR 2 /* string expected */
#define TF_EXPR 3 /* component or func. expected */
#define TF_NONE 4 /* no argument */
#define TF_MYBOX 5 /* special - get current user's mbox */
#define TF_NOW 6 /* special - get current unix time */
#define TF_EXPR_SV 7 /* like expr but save current str reg */
#define TF_NOP 8 /* like expr but no result */
char f_type; /* fmt type */
char extra; /* arg. type dependent extra info */
char flags;
#define TFL_PUTS 1 /* implicit putstr if top level */
#define TFL_PUTN 2 /* implicit putnum if top level */
};
static struct ftable functable[] = {
"nonzero", TF_EXPR, FT_V_NE, FT_IF_V_NE, 0,
"zero", TF_EXPR, FT_V_EQ, FT_IF_V_EQ, 0,
"eq", TF_NUM, FT_V_EQ, FT_IF_V_EQ, 0,
"ne", TF_NUM, FT_V_NE, FT_IF_V_NE, 0,
"gt", TF_NUM, FT_V_GT, FT_IF_V_GT, 0,
"null", TF_EXPR, FT_S_NULL, FT_IF_S_NULL, 0,
"nonnull", TF_EXPR, FT_S_NONNULL, FT_IF_S, 0,
"match", TF_STR, FT_V_MATCH, FT_IF_MATCH, 0,
"amatch", TF_STR, FT_V_AMATCH, FT_IF_AMATCH, 0,
"putstr", TF_EXPR, FT_STR, 0, 0,
"putstrf", TF_EXPR, FT_STRF, 0, 0,
"putnum", TF_EXPR, FT_NUM, 0, 0,
"putnumf", TF_EXPR, FT_NUMF, 0, 0,
"putaddr", TF_STR, FT_PUTADDR, 0, 0,
"void", TF_NOP, 0, 0, 0,
"comp", TF_COMP, FT_LS_COMP, 0, TFL_PUTS,
"lit", TF_STR, FT_LS_LIT, 0, TFL_PUTS,
"getenv", TF_STR, FT_LS_GETENV, 0, TFL_PUTS,
"trim", TF_EXPR, FT_LS_TRIM, 0, 0,
"compval", TF_COMP, FT_LV_COMP, 0, TFL_PUTN,
"compflag", TF_COMP, FT_LV_COMPFLAG, 0, TFL_PUTN,
"num", TF_NUM, FT_LV_LIT, 0, TFL_PUTN,
"msg", TF_NONE, FT_LV_DAT, 0, TFL_PUTN,
"cur", TF_NONE, FT_LV_DAT, 1, TFL_PUTN,
"size", TF_NONE, FT_LV_DAT, 2, TFL_PUTN,
"width", TF_NONE, FT_LV_DAT, 3, TFL_PUTN,
"unseen", TF_NONE, FT_LV_DAT, 4, TFL_PUTN,
"dat", TF_NUM, FT_LV_DAT, 0, TFL_PUTN,
"strlen", TF_NONE, FT_LV_STRLEN, 0, TFL_PUTN,
"me", TF_MYBOX, FT_LS_LIT, 0, TFL_PUTS,
"plus", TF_NUM, FT_LV_PLUS_L, 0, TFL_PUTN,
"minus", TF_NUM, FT_LV_MINUS_L, 0, TFL_PUTN,
"divide", TF_NUM, FT_LV_DIVIDE_L, 0, TFL_PUTN,
"modulo", TF_NUM, FT_LV_MODULO_L, 0, TFL_PUTN,
"charleft", TF_NONE, FT_LV_CHAR_LEFT, 0, TFL_PUTN,
"timenow", TF_NOW, FT_LV_LIT, 0, TFL_PUTN,
"month", TF_COMP, FT_LS_MONTH, FT_PARSEDATE, TFL_PUTS,
"lmonth", TF_COMP, FT_LS_LMONTH, FT_PARSEDATE, TFL_PUTS,
"tzone", TF_COMP, FT_LS_ZONE, FT_PARSEDATE, TFL_PUTS,
"day", TF_COMP, FT_LS_DAY, FT_PARSEDATE, TFL_PUTS,
"weekday", TF_COMP, FT_LS_WEEKDAY, FT_PARSEDATE, TFL_PUTS,
"tws", TF_COMP, FT_LS_822DATE, FT_PARSEDATE, TFL_PUTS,
"sec", TF_COMP, FT_LV_SEC, FT_PARSEDATE, TFL_PUTN,
"min", TF_COMP, FT_LV_MIN, FT_PARSEDATE, TFL_PUTN,
"hour", TF_COMP, FT_LV_HOUR, FT_PARSEDATE, TFL_PUTN,
"mday", TF_COMP, FT_LV_MDAY, FT_PARSEDATE, TFL_PUTN,
"mon", TF_COMP, FT_LV_MON, FT_PARSEDATE, TFL_PUTN,
"year", TF_COMP, FT_LV_YEAR, FT_PARSEDATE, TFL_PUTN,
"yday", TF_COMP, FT_LV_YDAY, FT_PARSEDATE, TFL_PUTN,
"wday", TF_COMP, FT_LV_WDAY, FT_PARSEDATE, TFL_PUTN,
"zone", TF_COMP, FT_LV_ZONE, FT_PARSEDATE, TFL_PUTN,
"clock", TF_COMP, FT_LV_CLOCK, FT_PARSEDATE, TFL_PUTN,
"rclock", TF_COMP, FT_LV_RCLOCK, FT_PARSEDATE, TFL_PUTN,
"sday", TF_COMP, FT_LV_DAYF, FT_PARSEDATE, TFL_PUTN,
"szone", TF_COMP, FT_LV_ZONEF, FT_PARSEDATE, TFL_PUTN,
"dst", TF_COMP, FT_LV_DST, FT_PARSEDATE, TFL_PUTN,
"pretty", TF_COMP, FT_LS_PRETTY, FT_PARSEDATE, TFL_PUTS,
"nodate", TF_COMP, FT_LV_COMPFLAG, FT_PARSEDATE, TFL_PUTN,
"date2local", TF_COMP, FT_LOCALDATE, FT_PARSEDATE, 0,
"date2gmt", TF_COMP, FT_GMTDATE, FT_PARSEDATE, 0,
"pers", TF_COMP, FT_LS_PERS, FT_PARSEADDR, TFL_PUTS,
"mbox", TF_COMP, FT_LS_MBOX, FT_PARSEADDR, TFL_PUTS,
"host", TF_COMP, FT_LS_HOST, FT_PARSEADDR, TFL_PUTS,
"path", TF_COMP, FT_LS_PATH, FT_PARSEADDR, TFL_PUTS,
"gname", TF_COMP, FT_LS_GNAME, FT_PARSEADDR, TFL_PUTS,
"note", TF_COMP, FT_LS_NOTE, FT_PARSEADDR, TFL_PUTS,
"addr", TF_COMP, FT_LS_ADDR, FT_PARSEADDR, TFL_PUTS,
"proper", TF_COMP, FT_LS_822ADDR, FT_PARSEADDR, TFL_PUTS,
"type", TF_COMP, FT_LV_HOSTTYPE, FT_PARSEADDR, TFL_PUTN,
"ingrp", TF_COMP, FT_LV_INGRPF, FT_PARSEADDR, TFL_PUTN,
"nohost", TF_COMP, FT_LV_NOHOSTF, FT_PARSEADDR, TFL_PUTN,
"formataddr", TF_EXPR_SV, FT_FORMATADDR, FT_FORMATADDR, 0,
"friendly", TF_COMP, FT_LS_FRIENDLY, FT_PARSEADDR, TFL_PUTS,
"mymbox", TF_COMP, FT_LV_COMPFLAG, FT_MYMBOX, TFL_PUTN,
"addtoseq", TF_STR, FT_ADDTOSEQ, 0, 0,
(char *)0, 0, 0, 0, 0
};
long time ();
static struct ftable *lookup(name)
register char *name;
{
register struct ftable *t = functable;
register char *nm;
register char c = *name;
while (nm = t->name) {
if (*nm == c && strcmp (nm, name) == 0)
return (ftbl = t);
t++;
}
return (struct ftable *)0;
}
#define NEWCOMP(cm,name)\
cm = ((struct comp *)calloc(1, sizeof (struct comp)));\
cm->c_name = name; ncomp++;\
i = CHASH(name); cm->c_next = wantcomp[i]; wantcomp[i] = cm;
#define NEWFMT (next_fp++)
#define NEW(type,fill,wid)\
fp=NEWFMT; fp->f_type=(type); fp->f_fill=(fill); fp->f_width=(wid);
#define ADDC(name)\
FINDCOMP( cm, name );\
if ( ! cm ) {\
NEWCOMP(cm,name);\
}\
fp->f_comp = cm;
#define LV( type, value ) NEW(type,0,0); fp->f_value = (value);
#define LS( type, str ) NEW(type,0,0); fp->f_text = (str);
#define PUTCOMP( comp ) NEW(FT_COMP,0,0); ADDC(comp);
#define PUTLIT( str ) NEW(FT_LIT,0,0); fp->f_text = (str);
#define PUTC( c ) NEW(FT_CHAR,0,0); fp->f_char = (c);
static char *compile();
static char *do_spec();
static char *do_name();
static char *do_func();
static char *do_expr();
static char *do_if();
static char *do_loop();
static char *format_string;
static char *usr_fstring; /* for CERROR */
#define CERROR(str) compile_error (str, cp)
static void
compile_error(str, cp)
char *str;
char *cp;
{
int errpos = cp - format_string;
int errctx = errpos > 20 ? 20 : errpos;
int i;
usr_fstring[errpos] = '\0';
for (i = errpos-errctx; i < errpos; i++)
#ifdef LOCALE
if (iscntrl(usr_fstring[i]))
#else
if (usr_fstring[i] < 32)
#endif
usr_fstring[i] = '_';
advise(NULLCP, "\"%s\": format compile error - %s",
&usr_fstring[errpos-errctx], str);
adios (NULLCP, "%*s", errctx+1, "^");
}
/*
* Compile format string "fstring" into format list "fmt".
* Return the number of header components found in the format
* string.
*/
fmt_compile( fstring, fmt )
register char *fstring;
struct format **fmt;
{
register char *cp;
int i;
if (format_string)
(void) free (format_string);
format_string = getcpy (fstring);
usr_fstring = fstring;
/* init the component hash table. */
for (i = 0; i < sizeof(wantcomp)/sizeof(wantcomp[0]); i++)
wantcomp[i] = 0;
bzero ((char *) &fmt_mnull, sizeof fmt_mnull);
/* it takes at least 4 char to generate one format so we
* allocate a worst-case format array using 1/4 the length
* of the format string. We actually need twice this much
* to handle both pre-processing (e.g., address parsing) and
* normal processing.
*/
i = strlen(fstring)/2 + 1;
next_fp = formatvec = (struct format *)calloc ((unsigned) i,
sizeof(struct format));
if (next_fp == NULL)
adios (NULLCP, "unable to allocate format storage");
ncomp = 0;
infunction = 0;
cp = compile(format_string);
if (*cp) {
CERROR("extra '%>', '%|' or '%?'");
}
LV(FT_DONE,0); /* really done */
*fmt = formatvec;
return (ncomp);
}
static char *compile (sp)
register char *sp;
{
register char *cp = sp;
register int c;
for (;;) {
sp = cp;
while ((c = *cp) && c != '%')
cp++;
*cp = 0;
switch (cp-sp) {
case 0:
break;
case 1:
PUTC(*sp);
break;
default:
PUTLIT(sp);
break;
}
if (c == 0)
return (cp);
switch (c = *++cp) {
case '%':
PUTC (*cp);
cp++;
break;
case '|':
case '>':
case '?':
case ']':
return (cp);
case '<':
cp = do_if(++cp);
break;
case '[': /* ] */
cp = do_loop(++cp);
break;
case ';': /* comment line */
cp++;
while ((c = *cp++) && c != '\n')
continue;
break;
default:
cp = do_spec(cp);
break;
}
}
}
static char *do_spec(sp)
register char *sp;
{
register char *cp = sp;
register int c;
#ifndef lint
register int ljust = 0;
#endif /* not lint */
register int wid = 0;
register char fill = ' ';
c = *cp++;
if (c == '-') {
ljust++;
c = *cp++;
}
if (c == '0') {
fill = c;
c = *cp++;
}
while (isdigit(c)) {
wid = wid*10 + (c - '0');
c = *cp++;
}
if (c == '{') {
cp = do_name(cp, 0);
if (! infunction)
fp->f_type = wid? FT_COMPF : FT_COMP;
}
else if (c == '(') {
cp = do_func(cp);
if (! infunction) {
if (ftbl->flags & TFL_PUTS) {
LV( wid? FT_STRF : FT_STR, ftbl->extra);
}
else if (ftbl->flags & TFL_PUTN) {
LV( wid? FT_NUMF : FT_NUM, ftbl->extra);
}
}
}
else {
CERROR("component or function name expected");
}
if (ljust)
wid = -wid;
fp->f_width = wid;
fp->f_fill = fill;
return (cp);
}
static char *do_name(sp, preprocess)
char *sp;
int preprocess;
{
register char *cp = sp;
register int c;
register int i;
static int primed = 0;
while (isalnum(c = *cp++) || c == '-')
;
if (c != '}') {
CERROR("'}' expected");
}
cp[-1] = '\0';
PUTCOMP(sp);
switch (preprocess) {
case FT_PARSEDATE:
if (cm->c_type & CT_ADDR) {
CERROR("component used as both date and address");
}
if (! (cm->c_type & CT_DATE)) {
cm->c_tws = (struct tws *)
calloc((unsigned) 1, sizeof *cm -> c_tws);
fp->f_type = preprocess;
PUTCOMP(sp);
cm->c_type |= CT_DATE;
}
break;
case FT_MYMBOX:
if (!primed) {
(void) ismymbox ((struct mailname *) 0);
primed++;
}
cm->c_type |= CT_MYMBOX;
/* fall through */
case FT_PARSEADDR:
if (cm->c_type & CT_DATE) {
CERROR("component used as both date and address");
}
if (! (cm->c_type & CT_ADDRPARSE)) {
cm->c_mn = &fmt_mnull;
fp->f_type = preprocess;
PUTCOMP(sp);
cm->c_type |= (CT_ADDR | CT_ADDRPARSE);
}
break;
case FT_FORMATADDR:
if (cm->c_type & CT_DATE) {
CERROR("component used as both date and address");
}
cm->c_type |= CT_ADDR;
break;
}
return (cp);
}
static char *do_func(sp)
char *sp;
{
register char *cp = sp;
register int c;
register struct ftable *t;
register int n;
int mflag; /* minus sign in NUM */
infunction++;
while (isalnum(c = *cp++))
;
if (c != '(' && c != '{' && c != ' ' && c != ')') {
CERROR("'(', '{', ' ' or ')' expected");
}
cp[-1] = '\0';
if ((t = lookup (sp)) == 0) {
CERROR("unknown function");
}
if (isspace(c))
c = *cp++;
switch (t->type) {
case TF_COMP:
if (c != '{') {
CERROR("component name expected");
}
cp = do_name(cp, t->extra);
fp->f_type = t->f_type;
c = *cp++;
break;
case TF_NUM:
if (mflag = (c == '-'))
c = *cp++;
n = 0;
while (isdigit(c)) {
n = n*10 + (c - '0');
c = *cp++;
}
if (mflag)
n = (-n);
LV(t->f_type,n);
break;
case TF_STR:
sp = cp - 1;
while (c && c != ')')
c = *cp++;
cp[-1] = '\0';
LS(t->f_type,sp);
break;
case TF_NONE:
LV(t->f_type,t->extra);
break;
case TF_MYBOX:
LS(t->f_type, getusr());
break;
case TF_NOW:
LV(t->f_type, time((long *) 0));
break;
case TF_EXPR_SV:
LV(FT_SAVESTR, 0);
/* fall through */
case TF_EXPR:
*--cp = c;
cp = do_expr(cp, t->extra);
LV(t->f_type, 0);
c = *cp++;
ftbl = t;
break;
case TF_NOP:
*--cp = c;
cp = do_expr(cp, t->extra);
c = *cp++;
ftbl = t;
break;
}
if (c != ')') {
CERROR("')' expected");
}
--infunction;
return (cp);
}
static char *do_expr (sp, preprocess)
char *sp;
{
register char *cp = sp;
register int c;
if ((c = *cp++) == '{') {
cp = do_name (cp, preprocess);
fp->f_type = FT_LS_COMP;
} else if (c == '(') {
cp = do_func (cp);
} else if (c == ')') {
return (--cp);
} else if (c == '%' && *cp == '<') {
cp = do_if (cp+1);
} else {
CERROR ("'(', '{', '%<' or ')' expected");
}
return (cp);
}
static char *do_loop(sp)
register char *sp;
{
register char *cp = sp;
struct format *floop;
floop = next_fp;
cp = compile (cp);
if (*cp++ != ']')
CERROR ("']' expected");
LV(FT_DONE, 1); /* not yet done */
LV(FT_GOTO, 0);
fp->f_skip = floop - fp; /* skip backwards */
return cp;
}
static char *do_if(sp)
register char *sp;
{
register char *cp = sp;
register struct format *fexpr,
*fif = (struct format *)NULL;
register int c = '<';
for (;;) {
if (c == '<') { /* doing an IF */
if ((c = *cp++) == '{') /*}*/{
cp = do_name(cp, 0);
fp->f_type = FT_LS_COMP;
LV (FT_IF_S, 0);
}
else if (c == '(') {
cp = do_func(cp);
/* see if we can merge the load and the "if" */
if (ftbl->f_type >= IF_FUNCS)
fp->f_type = ftbl->extra;
else {
LV (FT_IF_V_NE, 0);
}
}
else {
CERROR("'(' or '{' expected"); /*}*/
}
}
fexpr = fp; /* loc of [ELS]IF */
cp = compile (cp); /* compile IF TRUE stmts */
if (fif)
fif->f_skip = next_fp - fif;
if ((c = *cp++) == '|') { /* the last ELSE */
LV(FT_GOTO, 0);
fif = fp; /* loc of GOTO */
fexpr->f_skip = next_fp - fexpr;
fexpr = (struct format *)NULL;/* no extra ENDIF */
cp = compile (cp); /* compile ELSE stmts */
fif->f_skip = next_fp - fif;
c = *cp++;
}
else if (c == '?') { /* another ELSIF */
LV(FT_GOTO, 0);
fif = fp; /* loc of GOTO */
fexpr->f_skip = next_fp - fexpr;
c = '<'; /* impersonate an IF */
continue;
}
break;
}
if (c != '>') {
CERROR("'>' expected.");
}
if (fexpr) /* IF ... [ELSIF ...] ENDIF */
fexpr->f_skip = next_fp - fexpr;
return (cp);
}