3 * fmt_compile.c -- "compile" format strings for fmt_scan
10 #include <zotnet/tws/tws.h>
11 #include <h/fmt_scan.h>
12 #include <h/fmt_compile.h>
15 * hash table for deciding if a component is "interesting"
17 struct comp *wantcomp[128];
19 static struct format *formatvec; /* array to hold formats */
20 static struct format *next_fp; /* next free format slot */
21 static struct format *fp; /* current format slot */
22 static struct comp *cm; /* most recent comp ref */
23 static struct ftable *ftbl; /* most recent func ref */
25 static int infunction; /* function nesting cnt */
27 extern struct mailname fmt_mnull;
29 /* ftable->type (argument type) */
30 #define TF_COMP 0 /* component expected */
31 #define TF_NUM 1 /* number expected */
32 #define TF_STR 2 /* string expected */
33 #define TF_EXPR 3 /* component or func. expected */
34 #define TF_NONE 4 /* no argument */
35 #define TF_MYBOX 5 /* special - get current user's mbox */
36 #define TF_NOW 6 /* special - get current unix time */
37 #define TF_EXPR_SV 7 /* like expr but save current str reg */
38 #define TF_NOP 8 /* like expr but no result */
41 #define TFL_PUTS 1 /* implicit putstr if top level */
42 #define TFL_PUTN 2 /* implicit putnum if top level */
45 char *name; /* function name */
46 char type; /* argument type */
47 char f_type; /* fmt type */
48 char extra; /* arg. type dependent extra info */
52 static struct ftable functable[] = {
53 { "nonzero", TF_EXPR, FT_V_NE, FT_IF_V_NE, 0 },
54 { "zero", TF_EXPR, FT_V_EQ, FT_IF_V_EQ, 0 },
55 { "eq", TF_NUM, FT_V_EQ, FT_IF_V_EQ, 0 },
56 { "ne", TF_NUM, FT_V_NE, FT_IF_V_NE, 0 },
57 { "gt", TF_NUM, FT_V_GT, FT_IF_V_GT, 0 },
58 { "null", TF_EXPR, FT_S_NULL, FT_IF_S_NULL, 0 },
59 { "nonnull", TF_EXPR, FT_S_NONNULL, FT_IF_S, 0 },
60 { "match", TF_STR, FT_V_MATCH, FT_IF_MATCH, 0 },
61 { "amatch", TF_STR, FT_V_AMATCH, FT_IF_AMATCH, 0 },
63 { "putstr", TF_EXPR, FT_STR, 0, 0 },
64 { "putstrf", TF_EXPR, FT_STRF, 0, 0 },
65 { "putnum", TF_EXPR, FT_NUM, 0, 0 },
66 { "putnumf", TF_EXPR, FT_NUMF, 0, 0 },
67 { "putaddr", TF_STR, FT_PUTADDR, 0, 0 },
68 { "void", TF_NOP, 0, 0, 0 },
70 { "comp", TF_COMP, FT_LS_COMP, 0, TFL_PUTS },
71 { "lit", TF_STR, FT_LS_LIT, 0, TFL_PUTS },
72 { "getenv", TF_STR, FT_LS_GETENV, 0, TFL_PUTS },
73 { "profile", TF_STR, FT_LS_CFIND, 0, TFL_PUTS },
74 { "decodecomp", TF_COMP, FT_LS_DECODECOMP, 0, TFL_PUTS },
75 { "decode", TF_EXPR, FT_LS_DECODE, 0, TFL_PUTS },
76 { "trim", TF_EXPR, FT_LS_TRIM, 0, 0 },
77 { "compval", TF_COMP, FT_LV_COMP, 0, TFL_PUTN },
78 { "compflag", TF_COMP, FT_LV_COMPFLAG, 0, TFL_PUTN },
79 { "num", TF_NUM, FT_LV_LIT, 0, TFL_PUTN },
80 { "msg", TF_NONE, FT_LV_DAT, 0, TFL_PUTN },
81 { "cur", TF_NONE, FT_LV_DAT, 1, TFL_PUTN },
82 { "size", TF_NONE, FT_LV_DAT, 2, TFL_PUTN },
83 { "width", TF_NONE, FT_LV_DAT, 3, TFL_PUTN },
84 { "unseen", TF_NONE, FT_LV_DAT, 4, TFL_PUTN },
85 { "dat", TF_NUM, FT_LV_DAT, 0, TFL_PUTN },
86 { "strlen", TF_NONE, FT_LV_STRLEN, 0, TFL_PUTN },
87 { "me", TF_MYBOX, FT_LS_LIT, 0, TFL_PUTS },
88 { "plus", TF_NUM, FT_LV_PLUS_L, 0, TFL_PUTN },
89 { "minus", TF_NUM, FT_LV_MINUS_L, 0, TFL_PUTN },
90 { "divide", TF_NUM, FT_LV_DIVIDE_L, 0, TFL_PUTN },
91 { "modulo", TF_NUM, FT_LV_MODULO_L, 0, TFL_PUTN },
92 { "charleft", TF_NONE, FT_LV_CHAR_LEFT, 0, TFL_PUTN },
93 { "timenow", TF_NOW, FT_LV_LIT, 0, TFL_PUTN },
95 { "month", TF_COMP, FT_LS_MONTH, FT_PARSEDATE, TFL_PUTS },
96 { "lmonth", TF_COMP, FT_LS_LMONTH, FT_PARSEDATE, TFL_PUTS },
97 { "tzone", TF_COMP, FT_LS_ZONE, FT_PARSEDATE, TFL_PUTS },
98 { "day", TF_COMP, FT_LS_DAY, FT_PARSEDATE, TFL_PUTS },
99 { "weekday", TF_COMP, FT_LS_WEEKDAY, FT_PARSEDATE, TFL_PUTS },
100 { "tws", TF_COMP, FT_LS_822DATE, FT_PARSEDATE, TFL_PUTS },
101 { "sec", TF_COMP, FT_LV_SEC, FT_PARSEDATE, TFL_PUTN },
102 { "min", TF_COMP, FT_LV_MIN, FT_PARSEDATE, TFL_PUTN },
103 { "hour", TF_COMP, FT_LV_HOUR, FT_PARSEDATE, TFL_PUTN },
104 { "mday", TF_COMP, FT_LV_MDAY, FT_PARSEDATE, TFL_PUTN },
105 { "mon", TF_COMP, FT_LV_MON, FT_PARSEDATE, TFL_PUTN },
106 { "year", TF_COMP, FT_LV_YEAR, FT_PARSEDATE, TFL_PUTN },
107 { "yday", TF_COMP, FT_LV_YDAY, FT_PARSEDATE, TFL_PUTN },
108 { "wday", TF_COMP, FT_LV_WDAY, FT_PARSEDATE, TFL_PUTN },
109 { "zone", TF_COMP, FT_LV_ZONE, FT_PARSEDATE, TFL_PUTN },
110 { "clock", TF_COMP, FT_LV_CLOCK, FT_PARSEDATE, TFL_PUTN },
111 { "rclock", TF_COMP, FT_LV_RCLOCK, FT_PARSEDATE, TFL_PUTN },
112 { "sday", TF_COMP, FT_LV_DAYF, FT_PARSEDATE, TFL_PUTN },
113 { "szone", TF_COMP, FT_LV_ZONEF, FT_PARSEDATE, TFL_PUTN },
114 { "dst", TF_COMP, FT_LV_DST, FT_PARSEDATE, TFL_PUTN },
115 { "pretty", TF_COMP, FT_LS_PRETTY, FT_PARSEDATE, TFL_PUTS },
116 { "nodate", TF_COMP, FT_LV_COMPFLAG, FT_PARSEDATE, TFL_PUTN },
117 { "date2local", TF_COMP, FT_LOCALDATE, FT_PARSEDATE, 0 },
118 { "date2gmt", TF_COMP, FT_GMTDATE, FT_PARSEDATE, 0 },
120 { "pers", TF_COMP, FT_LS_PERS, FT_PARSEADDR, TFL_PUTS },
121 { "mbox", TF_COMP, FT_LS_MBOX, FT_PARSEADDR, TFL_PUTS },
122 { "host", TF_COMP, FT_LS_HOST, FT_PARSEADDR, TFL_PUTS },
123 { "path", TF_COMP, FT_LS_PATH, FT_PARSEADDR, TFL_PUTS },
124 { "gname", TF_COMP, FT_LS_GNAME, FT_PARSEADDR, TFL_PUTS },
125 { "note", TF_COMP, FT_LS_NOTE, FT_PARSEADDR, TFL_PUTS },
126 { "addr", TF_COMP, FT_LS_ADDR, FT_PARSEADDR, TFL_PUTS },
127 { "proper", TF_COMP, FT_LS_822ADDR, FT_PARSEADDR, TFL_PUTS },
128 { "type", TF_COMP, FT_LV_HOSTTYPE, FT_PARSEADDR, TFL_PUTN },
129 { "ingrp", TF_COMP, FT_LV_INGRPF, FT_PARSEADDR, TFL_PUTN },
130 { "nohost", TF_COMP, FT_LV_NOHOSTF, FT_PARSEADDR, TFL_PUTN },
131 { "formataddr", TF_EXPR_SV,FT_FORMATADDR, FT_FORMATADDR, 0 },
132 { "friendly", TF_COMP, FT_LS_FRIENDLY, FT_PARSEADDR, TFL_PUTS },
134 { "mymbox", TF_COMP, FT_LV_COMPFLAG, FT_MYMBOX, TFL_PUTN },
135 { "addtoseq", TF_STR, FT_ADDTOSEQ, 0, 0 },
140 /* Add new component to the hash table */
141 #define NEWCOMP(cm,name)\
142 cm = ((struct comp *) calloc(1, sizeof (struct comp)));\
146 cm->c_next = wantcomp[i];\
149 #define NEWFMT (next_fp++)
150 #define NEW(type,fill,wid)\
151 fp=NEWFMT; fp->f_type=(type); fp->f_fill=(fill); fp->f_width=(wid);
153 /* Add (possibly new) component to the hash table */
161 #define LV(type, value) NEW(type,0,0); fp->f_value = (value);
162 #define LS(type, str) NEW(type,0,0); fp->f_text = (str);
164 #define PUTCOMP(comp) NEW(FT_COMP,0,0); ADDC(comp);
165 #define PUTLIT(str) NEW(FT_LIT,0,0); fp->f_text = (str);
166 #define PUTC(c) NEW(FT_CHAR,0,0); fp->f_char = (c);
168 static char *format_string;
169 static char *usr_fstring; /* for CERROR */
171 #define CERROR(str) compile_error (str, cp)
174 * external prototypes
176 extern char *getusername(void);
181 static struct ftable *lookup(char *);
182 static void compile_error(char *, char *);
183 static char *compile (char *);
184 static char *do_spec(char *);
185 static char *do_name(char *, int);
186 static char *do_func(char *);
187 static char *do_expr (char *, int);
188 static char *do_loop(char *);
189 static char *do_if(char *);
192 static struct ftable *
195 register struct ftable *t = functable;
197 register char c = *name;
199 while ((nm = t->name)) {
200 if (*nm == c && strcmp (nm, name) == 0)
205 return (struct ftable *) 0;
210 compile_error(char *str, char *cp)
212 int i, errpos, errctx;
214 errpos = cp - format_string;
215 errctx = errpos > 20 ? 20 : errpos;
216 usr_fstring[errpos] = '\0';
218 for (i = errpos-errctx; i < errpos; i++) {
220 if (iscntrl(usr_fstring[i]))
222 if (usr_fstring[i] < 32)
224 usr_fstring[i] = '_';
227 advise(NULL, "\"%s\": format compile error - %s",
228 &usr_fstring[errpos-errctx], str);
229 adios (NULL, "%*s", errctx+1, "^");
233 * Compile format string "fstring" into format list "fmt".
234 * Return the number of header components found in the format
239 fmt_compile(char *fstring, struct format **fmt)
245 free (format_string);
246 format_string = getcpy (fstring);
247 usr_fstring = fstring;
249 /* init the component hash table. */
250 for (i = 0; i < sizeof(wantcomp)/sizeof(wantcomp[0]); i++)
253 memset((char *) &fmt_mnull, 0, sizeof(fmt_mnull));
255 /* it takes at least 4 char to generate one format so we
256 * allocate a worst-case format array using 1/4 the length
257 * of the format string. We actually need twice this much
258 * to handle both pre-processing (e.g., address parsing) and
261 i = strlen(fstring)/2 + 1;
262 next_fp = formatvec = (struct format *)calloc ((size_t) i,
263 sizeof(struct format));
265 adios (NULL, "unable to allocate format storage");
270 cp = compile(format_string);
272 CERROR("extra '%>', '%|' or '%?'");
274 LV(FT_DONE, 0); /* really done */
283 register char *cp = sp;
288 while ((c = *cp) && c != '%')
324 case ';': /* comment line */
326 while ((c = *cp++) && c != '\n')
341 register char *cp = sp;
344 register int ljust = 0;
345 #endif /* not lint */
346 register int wid = 0;
347 register char fill = ' ';
359 wid = wid*10 + (c - '0');
365 fp->f_type = wid? FT_COMPF : FT_COMP;
370 if (ftbl->flags & TFL_PUTS) {
371 LV( wid? FT_STRF : FT_STR, ftbl->extra);
373 else if (ftbl->flags & TFL_PUTN) {
374 LV( wid? FT_NUMF : FT_NUM, ftbl->extra);
379 CERROR("component or function name expected");
390 do_name(char *sp, int preprocess)
392 register char *cp = sp;
395 static int primed = 0;
397 while (isalnum(c = *cp++) || c == '-' || c == '_')
400 CERROR("'}' expected");
404 switch (preprocess) {
407 if (cm->c_type & CT_ADDR) {
408 CERROR("component used as both date and address");
410 if (! (cm->c_type & CT_DATE)) {
411 cm->c_tws = (struct tws *)
412 calloc((size_t) 1, sizeof(*cm->c_tws));
413 fp->f_type = preprocess;
415 cm->c_type |= CT_DATE;
421 ismymbox ((struct mailname *) 0);
424 cm->c_type |= CT_MYMBOX;
427 if (cm->c_type & CT_DATE) {
428 CERROR("component used as both date and address");
430 if (! (cm->c_type & CT_ADDRPARSE)) {
431 cm->c_mn = &fmt_mnull;
432 fp->f_type = preprocess;
434 cm->c_type |= (CT_ADDR | CT_ADDRPARSE);
439 if (cm->c_type & CT_DATE) {
440 CERROR("component used as both date and address");
442 cm->c_type |= CT_ADDR;
451 register char *cp = sp;
453 register struct ftable *t;
455 int mflag; /* minus sign in NUM */
459 while (isalnum(c = *cp++))
461 if (c != '(' && c != '{' && c != ' ' && c != ')') {
462 CERROR("'(', '{', ' ' or ')' expected");
465 if ((t = lookup (sp)) == 0) {
466 CERROR("unknown function");
475 CERROR("component name expected");
477 cp = do_name(cp, t->extra);
478 fp->f_type = t->f_type;
483 if ((mflag = (c == '-')))
487 n = n*10 + (c - '0');
497 while (c && c != ')')
504 LV(t->f_type,t->extra);
508 LS(t->f_type, getusername());
512 LV(t->f_type, time((time_t *) 0));
520 cp = do_expr(cp, t->extra);
528 cp = do_expr(cp, t->extra);
534 CERROR("')' expected");
541 do_expr (char *sp, int preprocess)
543 register char *cp = sp;
546 if ((c = *cp++) == '{') {
547 cp = do_name (cp, preprocess);
548 fp->f_type = FT_LS_COMP;
549 } else if (c == '(') {
551 } else if (c == ')') {
553 } else if (c == '%' && *cp == '<') {
556 CERROR ("'(', '{', '%<' or ')' expected");
564 register char *cp = sp;
565 struct format *floop;
570 CERROR ("']' expected");
572 LV(FT_DONE, 1); /* not yet done */
574 fp->f_skip = floop - fp; /* skip backwards */
582 register char *cp = sp;
583 register struct format *fexpr,
584 *fif = (struct format *)NULL;
585 register int c = '<';
588 if (c == '<') { /* doing an IF */
589 if ((c = *cp++) == '{') /*}*/{
591 fp->f_type = FT_LS_COMP;
596 /* see if we can merge the load and the "if" */
597 if (ftbl->f_type >= IF_FUNCS)
598 fp->f_type = ftbl->extra;
604 CERROR("'(' or '{' expected"); /*}*/
608 fexpr = fp; /* loc of [ELS]IF */
609 cp = compile (cp); /* compile IF TRUE stmts */
611 fif->f_skip = next_fp - fif;
613 if ((c = *cp++) == '|') { /* the last ELSE */
615 fif = fp; /* loc of GOTO */
616 fexpr->f_skip = next_fp - fexpr;
618 fexpr = (struct format *)NULL;/* no extra ENDIF */
620 cp = compile (cp); /* compile ELSE stmts */
621 fif->f_skip = next_fp - fif;
624 else if (c == '?') { /* another ELSIF */
626 fif = fp; /* loc of GOTO */
627 fexpr->f_skip = next_fp - fexpr;
629 c = '<'; /* impersonate an IF */
636 CERROR("'>' expected.");
639 if (fexpr) /* IF ... [ELSIF ...] ENDIF */
640 fexpr->f_skip = next_fp - fexpr;