diplodocus.org Git - nmh/blob - sbr/fmt_compile.c

   1
   2 /*
   3  * fmt_compile.c -- "compile" format strings for fmt_scan
   4  *
   5  * $Id$
   6  *
   7  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   8  * COPYRIGHT file in the root directory of the nmh distribution for
   9  * complete copyright information.
  10  */
  11
  12 #include <h/mh.h>
  13 #include <h/addrsbr.h>
  14 #include <h/tws.h>
  15 #include <h/fmt_scan.h>
  16 #include <h/fmt_compile.h>
  17
  18 #ifdef TIME_WITH_SYS_TIME
  19 # include <sys/time.h>
  20 # include <time.h>
  21 #else
  22 # ifdef TM_IN_SYS_TIME
  23 #  include <sys/time.h>
  24 # else
  25 #  include <time.h>
  26 # endif
  27 #endif
  28
  29 /*
  30  * hash table for deciding if a component is "interesting"
  31  */
  32 struct comp *wantcomp[128];
  33
  34 static struct format *formatvec;        /* array to hold formats */
  35 static struct format *next_fp;          /* next free format slot */
  36 static struct format *fp;               /* current format slot   */
  37 static struct comp *cm;                 /* most recent comp ref  */
  38 static struct ftable *ftbl;             /* most recent func ref  */
  39 static int ncomp;
  40 static int infunction;                  /* function nesting cnt  */
  41
  42 extern struct mailname fmt_mnull;
  43
  44 /* ftable->type (argument type) */
  45 #define TF_COMP    0        /* component expected                 */
  46 #define TF_NUM     1        /* number expected                    */
  47 #define TF_STR     2        /* string expected                    */
  48 #define TF_EXPR    3        /* component or func. expected        */
  49 #define TF_NONE    4        /* no argument                        */
  50 #define TF_MYBOX   5        /* special - get current user's mbox  */
  51 #define TF_NOW     6        /* special - get current unix time    */
  52 #define TF_EXPR_SV 7        /* like expr but save current str reg */
  53 #define TF_NOP     8        /* like expr but no result            */
  54
  55 /* ftable->flags */
  56 #define TFL_PUTS   1        /* implicit putstr if top level */
  57 #define TFL_PUTN   2        /* implicit putnum if top level */
  58
  59 struct ftable {
  60     char *name;         /* function name                  */
  61     char type;          /* argument type                  */
  62     char f_type;        /* fmt type                       */
  63     char extra;         /* arg. type dependent extra info */
  64     char flags;
  65 };
  66
  67 static struct ftable functable[] = {
  68      { "nonzero",    TF_EXPR,   FT_V_NE,        FT_IF_V_NE,     0 },
  69      { "zero",       TF_EXPR,   FT_V_EQ,        FT_IF_V_EQ,     0 },
  70      { "eq",         TF_NUM,    FT_V_EQ,        FT_IF_V_EQ,     0 },
  71      { "ne",         TF_NUM,    FT_V_NE,        FT_IF_V_NE,     0 },
  72      { "gt",         TF_NUM,    FT_V_GT,        FT_IF_V_GT,     0 },
  73      { "null",       TF_EXPR,   FT_S_NULL,      FT_IF_S_NULL,   0 },
  74      { "nonnull",    TF_EXPR,   FT_S_NONNULL,   FT_IF_S,        0 },
  75      { "match",      TF_STR,    FT_V_MATCH,     FT_IF_MATCH,    0 },
  76      { "amatch",     TF_STR,    FT_V_AMATCH,    FT_IF_AMATCH,   0 },
  77
  78      { "putstr",     TF_EXPR,   FT_STR,         0,              0 },
  79      { "putstrf",    TF_EXPR,   FT_STRF,        0,              0 },
  80      { "putnum",     TF_EXPR,   FT_NUM,         0,              0 },
  81      { "putnumf",    TF_EXPR,   FT_NUMF,        0,              0 },
  82      { "putaddr",    TF_STR,    FT_PUTADDR,     0,              0 },
  83      { "void",       TF_NOP,    0,              0,              0 },
  84
  85      { "comp",       TF_COMP,   FT_LS_COMP,     0,              TFL_PUTS },
  86      { "lit",        TF_STR,    FT_LS_LIT,      0,              TFL_PUTS },
  87      { "getenv",     TF_STR,    FT_LS_GETENV,   0,              TFL_PUTS },
  88      { "profile",    TF_STR,    FT_LS_CFIND,    0,              TFL_PUTS },
  89      { "decodecomp", TF_COMP,   FT_LS_DECODECOMP, 0,            TFL_PUTS },
  90      { "decode",     TF_EXPR,   FT_LS_DECODE,   0,              TFL_PUTS },
  91      { "trim",       TF_EXPR,   FT_LS_TRIM,     0,              0 },
  92      { "compval",    TF_COMP,   FT_LV_COMP,     0,              TFL_PUTN },
  93      { "compflag",   TF_COMP,   FT_LV_COMPFLAG, 0,              TFL_PUTN },
  94      { "num",        TF_NUM,    FT_LV_LIT,      0,              TFL_PUTN },
  95      { "msg",        TF_NONE,   FT_LV_DAT,      0,              TFL_PUTN },
  96      { "cur",        TF_NONE,   FT_LV_DAT,      1,              TFL_PUTN },
  97      { "size",       TF_NONE,   FT_LV_DAT,      2,              TFL_PUTN },
  98      { "width",      TF_NONE,   FT_LV_DAT,      3,              TFL_PUTN },
  99      { "unseen",     TF_NONE,   FT_LV_DAT,      4,              TFL_PUTN },
 100      { "dat",        TF_NUM,    FT_LV_DAT,      0,              TFL_PUTN },
 101      { "strlen",     TF_NONE,   FT_LV_STRLEN,   0,              TFL_PUTN },
 102      { "me",         TF_MYBOX,  FT_LS_LIT,      0,              TFL_PUTS },
 103      { "plus",       TF_NUM,    FT_LV_PLUS_L,   0,              TFL_PUTN },
 104      { "minus",      TF_NUM,    FT_LV_MINUS_L,  0,              TFL_PUTN },
 105      { "divide",     TF_NUM,    FT_LV_DIVIDE_L, 0,              TFL_PUTN },
 106      { "modulo",     TF_NUM,    FT_LV_MODULO_L, 0,              TFL_PUTN },
 107      { "charleft",   TF_NONE,   FT_LV_CHAR_LEFT, 0,             TFL_PUTN },
 108      { "timenow",    TF_NOW,    FT_LV_LIT,      0,              TFL_PUTN },
 109
 110      { "month",      TF_COMP,   FT_LS_MONTH,    FT_PARSEDATE,   TFL_PUTS },
 111      { "lmonth",     TF_COMP,   FT_LS_LMONTH,   FT_PARSEDATE,   TFL_PUTS },
 112      { "tzone",      TF_COMP,   FT_LS_ZONE,     FT_PARSEDATE,   TFL_PUTS },
 113      { "day",        TF_COMP,   FT_LS_DAY,      FT_PARSEDATE,   TFL_PUTS },
 114      { "weekday",    TF_COMP,   FT_LS_WEEKDAY,  FT_PARSEDATE,   TFL_PUTS },
 115      { "tws",        TF_COMP,   FT_LS_822DATE,  FT_PARSEDATE,   TFL_PUTS },
 116      { "sec",        TF_COMP,   FT_LV_SEC,      FT_PARSEDATE,   TFL_PUTN },
 117      { "min",        TF_COMP,   FT_LV_MIN,      FT_PARSEDATE,   TFL_PUTN },
 118      { "hour",       TF_COMP,   FT_LV_HOUR,     FT_PARSEDATE,   TFL_PUTN },
 119      { "mday",       TF_COMP,   FT_LV_MDAY,     FT_PARSEDATE,   TFL_PUTN },
 120      { "mon",        TF_COMP,   FT_LV_MON,      FT_PARSEDATE,   TFL_PUTN },
 121      { "year",       TF_COMP,   FT_LV_YEAR,     FT_PARSEDATE,   TFL_PUTN },
 122      { "yday",       TF_COMP,   FT_LV_YDAY,     FT_PARSEDATE,   TFL_PUTN },
 123      { "wday",       TF_COMP,   FT_LV_WDAY,     FT_PARSEDATE,   TFL_PUTN },
 124      { "zone",       TF_COMP,   FT_LV_ZONE,     FT_PARSEDATE,   TFL_PUTN },
 125      { "clock",      TF_COMP,   FT_LV_CLOCK,    FT_PARSEDATE,   TFL_PUTN },
 126      { "rclock",     TF_COMP,   FT_LV_RCLOCK,   FT_PARSEDATE,   TFL_PUTN },
 127      { "sday",       TF_COMP,   FT_LV_DAYF,     FT_PARSEDATE,   TFL_PUTN },
 128      { "szone",      TF_COMP,   FT_LV_ZONEF,    FT_PARSEDATE,   TFL_PUTN },
 129      { "dst",        TF_COMP,   FT_LV_DST,      FT_PARSEDATE,   TFL_PUTN },
 130      { "pretty",     TF_COMP,   FT_LS_PRETTY,   FT_PARSEDATE,   TFL_PUTS },
 131      { "nodate",     TF_COMP,   FT_LV_COMPFLAG, FT_PARSEDATE,   TFL_PUTN },
 132      { "date2local", TF_COMP,   FT_LOCALDATE,   FT_PARSEDATE,   0 },
 133      { "date2gmt",   TF_COMP,   FT_GMTDATE,     FT_PARSEDATE,   0 },
 134
 135      { "pers",       TF_COMP,   FT_LS_PERS,     FT_PARSEADDR,   TFL_PUTS },
 136      { "mbox",       TF_COMP,   FT_LS_MBOX,     FT_PARSEADDR,   TFL_PUTS },
 137      { "host",       TF_COMP,   FT_LS_HOST,     FT_PARSEADDR,   TFL_PUTS },
 138      { "path",       TF_COMP,   FT_LS_PATH,     FT_PARSEADDR,   TFL_PUTS },
 139      { "gname",      TF_COMP,   FT_LS_GNAME,    FT_PARSEADDR,   TFL_PUTS },
 140      { "note",       TF_COMP,   FT_LS_NOTE,     FT_PARSEADDR,   TFL_PUTS },
 141      { "addr",       TF_COMP,   FT_LS_ADDR,     FT_PARSEADDR,   TFL_PUTS },
 142      { "proper",     TF_COMP,   FT_LS_822ADDR,  FT_PARSEADDR,   TFL_PUTS },
 143      { "type",       TF_COMP,   FT_LV_HOSTTYPE, FT_PARSEADDR,   TFL_PUTN },
 144      { "ingrp",      TF_COMP,   FT_LV_INGRPF,   FT_PARSEADDR,   TFL_PUTN },
 145      { "nohost",     TF_COMP,   FT_LV_NOHOSTF,  FT_PARSEADDR,   TFL_PUTN },
 146      { "formataddr", TF_EXPR_SV,FT_FORMATADDR,  FT_FORMATADDR,  0 },
 147      { "friendly",   TF_COMP,   FT_LS_FRIENDLY, FT_PARSEADDR,   TFL_PUTS },
 148
 149      { "mymbox",     TF_COMP,   FT_LV_COMPFLAG, FT_MYMBOX,      TFL_PUTN },
 150      { "addtoseq",   TF_STR,    FT_ADDTOSEQ,    0,              0 },
 151
 152      { NULL,         0,         0,              0,              0 }
 153 };
 154
 155 /* Add new component to the hash table */
 156 #define NEWCOMP(cm,name)\
 157         cm = ((struct comp *) calloc(1, sizeof (struct comp)));\
 158         cm->c_name = name;\
 159         ncomp++;\
 160         i = CHASH(name);\
 161         cm->c_next = wantcomp[i];\
 162         wantcomp[i] = cm;
 163
 164 #define NEWFMT (next_fp++)
 165 #define NEW(type,fill,wid)\
 166         fp=NEWFMT; fp->f_type=(type); fp->f_fill=(fill); fp->f_width=(wid);
 167
 168 /* Add (possibly new) component to the hash table */
 169 #define ADDC(name)\
 170         FINDCOMP(cm, name);\
 171         if (!cm) {\
 172             NEWCOMP(cm,name);\
 173         }\
 174         fp->f_comp = cm;
 175
 176 #define LV(type, value)         NEW(type,0,0); fp->f_value = (value);
 177 #define LS(type, str)           NEW(type,0,0); fp->f_text = (str);
 178
 179 #define PUTCOMP(comp)           NEW(FT_COMP,0,0); ADDC(comp);
 180 #define PUTLIT(str)             NEW(FT_LIT,0,0); fp->f_text = (str);
 181 #define PUTC(c)                 NEW(FT_CHAR,0,0); fp->f_char = (c);
 182
 183 static char *format_string;
 184 static char *usr_fstring;       /* for CERROR */
 185
 186 #define CERROR(str) compile_error (str, cp)
 187
 188 /*
 189  * external prototypes
 190  */
 191 extern char *getusername(void);
 192
 193 /*
 194  * static prototypes
 195  */
 196 static struct ftable *lookup(char *);
 197 static void compile_error(char *, char *);
 198 static char *compile (char *);
 199 static char *do_spec(char *);
 200 static char *do_name(char *, int);
 201 static char *do_func(char *);
 202 static char *do_expr (char *, int);
 203 static char *do_loop(char *);
 204 static char *do_if(char *);
 205
 206
 207 static struct ftable *
 208 lookup(char *name)
 209 {
 210     register struct ftable *t = functable;
 211     register char *nm;
 212     register char c = *name;
 213
 214     while ((nm = t->name)) {
 215         if (*nm == c && strcmp (nm, name) == 0)
 216             return (ftbl = t);
 217
 218         t++;
 219     }
 220     return (struct ftable *) 0;
 221 }
 222
 223
 224 static void
 225 compile_error(char *str, char *cp)
 226 {
 227     int i, errpos, errctx;
 228
 229     errpos = cp - format_string;
 230     errctx = errpos > 20 ? 20 : errpos;
 231     usr_fstring[errpos] = '\0';
 232
 233     for (i = errpos-errctx; i < errpos; i++) {
 234 #ifdef LOCALE
 235         if (iscntrl(usr_fstring[i]))
 236 #else
 237         if (usr_fstring[i] < 32)
 238 #endif
 239             usr_fstring[i] = '_';
 240     }
 241
 242     advise(NULL, "\"%s\": format compile error - %s",
 243            &usr_fstring[errpos-errctx], str);
 244     adios (NULL, "%*s", errctx+1, "^");
 245 }
 246
 247 /*
 248  * Compile format string "fstring" into format list "fmt".
 249  * Return the number of header components found in the format
 250  * string.
 251  */
 252
 253 int
 254 fmt_compile(char *fstring, struct format **fmt)
 255 {
 256     register char *cp;
 257     int i;
 258
 259     if (format_string)
 260         free (format_string);
 261     format_string = getcpy (fstring);
 262     usr_fstring = fstring;
 263
 264     /* init the component hash table. */
 265     for (i = 0; i < sizeof(wantcomp)/sizeof(wantcomp[0]); i++)
 266         wantcomp[i] = 0;
 267
 268     memset((char *) &fmt_mnull, 0, sizeof(fmt_mnull));
 269
 270     /* it takes at least 4 char to generate one format so we
 271      * allocate a worst-case format array using 1/4 the length
 272      * of the format string.  We actually need twice this much
 273      * to handle both pre-processing (e.g., address parsing) and
 274      * normal processing.
 275      */
 276     i = strlen(fstring)/2 + 1;
 277                 if (i==1) i++;
 278     next_fp = formatvec = (struct format *)calloc ((size_t) i,
 279                                                    sizeof(struct format));
 280     if (next_fp == NULL)
 281         adios (NULL, "unable to allocate format storage");
 282
 283     ncomp = 0;
 284     infunction = 0;
 285
 286     cp = compile(format_string);
 287     if (*cp) {
 288         CERROR("extra '%>', '%|' or '%?'");
 289     }
 290     LV(FT_DONE, 0);             /* really done */
 291     *fmt = formatvec;
 292
 293     return (ncomp);
 294 }
 295
 296 static char *
 297 compile (char *sp)
 298 {
 299     register char *cp = sp;
 300     register int  c;
 301
 302     for (;;) {
 303         sp = cp;
 304         while ((c = *cp) && c != '%')
 305             cp++;
 306         *cp = 0;
 307         switch (cp-sp) {
 308         case 0:
 309             break;
 310         case 1:
 311             PUTC(*sp);
 312             break;
 313         default:
 314             PUTLIT(sp);
 315             break;
 316         }
 317         if (c == 0)
 318             return (cp);
 319
 320         switch (c = *++cp) {
 321         case '%':
 322             PUTC (*cp);
 323             cp++;
 324             break;
 325
 326         case '|':
 327         case '>':
 328         case '?':
 329         case ']':
 330             return (cp);
 331
 332         case '<':
 333             cp = do_if(++cp);
 334             break;
 335
 336         case '[':       /* ] */
 337             cp = do_loop(++cp);
 338             break;
 339
 340         case ';':       /* comment line */
 341             cp++;
 342             while ((c = *cp++) && c != '\n')
 343                 continue;
 344             break;
 345
 346         default:
 347             cp = do_spec(cp);
 348             break;
 349         }
 350     }
 351 }
 352
 353
 354 static char *
 355 do_spec(char *sp)
 356 {
 357     register char *cp = sp;
 358     register int c;
 359 #ifndef lint
 360     register int ljust = 0;
 361 #endif  /* not lint */
 362     register int wid = 0;
 363     register char fill = ' ';
 364
 365     c = *cp++;
 366     if (c == '-') {
 367         ljust++;
 368         c = *cp++;
 369     }
 370     if (c == '0') {
 371         fill = c;
 372         c = *cp++;
 373     }
 374     while (isdigit(c)) {
 375         wid = wid*10 + (c - '0');
 376         c = *cp++;
 377     }
 378     if (c == '{') {
 379         cp = do_name(cp, 0);
 380         if (! infunction)
 381             fp->f_type = wid? FT_COMPF : FT_COMP;
 382     }
 383     else if (c == '(') {
 384         cp = do_func(cp);
 385         if (! infunction) {
 386             if (ftbl->flags & TFL_PUTS) {
 387                 LV( wid? FT_STRF : FT_STR, ftbl->extra);
 388             }
 389             else if (ftbl->flags & TFL_PUTN) {
 390                 LV( wid? FT_NUMF : FT_NUM, ftbl->extra);
 391             }
 392         }
 393     }
 394     else {
 395         CERROR("component or function name expected");
 396     }
 397     if (ljust)
 398         wid = -wid;
 399     fp->f_width = wid;
 400     fp->f_fill = fill;
 401
 402     return (cp);
 403 }
 404
 405 static char *
 406 do_name(char *sp, int preprocess)
 407 {
 408     register char *cp = sp;
 409     register int c;
 410     register int i;
 411     static int primed = 0;
 412
 413     while (isalnum(c = *cp++) || c == '-' || c == '_')
 414         ;
 415     if (c != '}') {
 416         CERROR("'}' expected");
 417     }
 418     cp[-1] = '\0';
 419     PUTCOMP(sp);
 420     switch (preprocess) {
 421
 422     case FT_PARSEDATE:
 423         if (cm->c_type & CT_ADDR) {
 424             CERROR("component used as both date and address");
 425         }
 426         if (! (cm->c_type & CT_DATE)) {
 427             cm->c_tws = (struct tws *)
 428                                 calloc((size_t) 1, sizeof(*cm->c_tws));
 429             fp->f_type = preprocess;
 430             PUTCOMP(sp);
 431             cm->c_type |= CT_DATE;
 432         }
 433         break;
 434
 435     case FT_MYMBOX:
 436         if (!primed) {
 437             ismymbox ((struct mailname *) 0);
 438             primed++;
 439         }
 440         cm->c_type |= CT_MYMBOX;
 441         /* fall through */
 442     case FT_PARSEADDR:
 443         if (cm->c_type & CT_DATE) {
 444             CERROR("component used as both date and address");
 445         }
 446         if (! (cm->c_type & CT_ADDRPARSE)) {
 447             cm->c_mn = &fmt_mnull;
 448             fp->f_type = preprocess;
 449             PUTCOMP(sp);
 450             cm->c_type |= (CT_ADDR | CT_ADDRPARSE);
 451         }
 452         break;
 453
 454     case FT_FORMATADDR:
 455         if (cm->c_type & CT_DATE) {
 456             CERROR("component used as both date and address");
 457         }
 458         cm->c_type |= CT_ADDR;
 459         break;
 460     }
 461     return (cp);
 462 }
 463
 464 static char *
 465 do_func(char *sp)
 466 {
 467     register char *cp = sp;
 468     register int c;
 469     register struct ftable *t;
 470     register int n;
 471     int mflag;          /* minus sign in NUM */
 472
 473     infunction++;
 474
 475     while (isalnum(c = *cp++))
 476         ;
 477     if (c != '(' && c != '{' && c != ' ' && c != ')') {
 478         CERROR("'(', '{', ' ' or ')' expected");
 479     }
 480     cp[-1] = '\0';
 481     if ((t = lookup (sp)) == 0) {
 482         CERROR("unknown function");
 483     }
 484     if (isspace(c))
 485         c = *cp++;
 486
 487     switch (t->type) {
 488
 489     case TF_COMP:
 490         if (c != '{') {
 491             CERROR("component name expected");
 492         }
 493         cp = do_name(cp, t->extra);
 494         fp->f_type = t->f_type;
 495         c = *cp++;
 496         break;
 497
 498     case TF_NUM:
 499         if ((mflag = (c == '-')))
 500             c = *cp++;
 501         n = 0;
 502         while (isdigit(c)) {
 503             n = n*10 + (c - '0');
 504             c = *cp++;
 505         }
 506         if (mflag)
 507             n = (-n);
 508         LV(t->f_type,n);
 509         break;
 510
 511     case TF_STR:
 512         sp = cp - 1;
 513         while (c && c != ')')
 514             c = *cp++;
 515         cp[-1] = '\0';
 516         LS(t->f_type,sp);
 517         break;
 518
 519     case TF_NONE:
 520         LV(t->f_type,t->extra);
 521         break;
 522
 523     case TF_MYBOX:
 524         LS(t->f_type, getusername());
 525         break;
 526
 527     case TF_NOW:
 528         LV(t->f_type, time((time_t *) 0));
 529         break;
 530
 531     case TF_EXPR_SV:
 532         LV(FT_SAVESTR, 0);
 533         /* fall through */
 534     case TF_EXPR:
 535         *--cp = c;
 536         cp = do_expr(cp, t->extra);
 537         LV(t->f_type, 0);
 538         c = *cp++;
 539         ftbl = t;
 540         break;
 541
 542     case TF_NOP:
 543         *--cp = c;
 544         cp = do_expr(cp, t->extra);
 545         c = *cp++;
 546         ftbl = t;
 547         break;
 548     }
 549     if (c != ')') {
 550         CERROR("')' expected");
 551     }
 552     --infunction;
 553     return (cp);
 554 }
 555
 556 static char *
 557 do_expr (char *sp, int preprocess)
 558 {
 559     register char *cp = sp;
 560     register int  c;
 561
 562     if ((c = *cp++) == '{') {
 563         cp = do_name (cp, preprocess);
 564         fp->f_type = FT_LS_COMP;
 565     } else if (c == '(') {
 566         cp = do_func (cp);
 567     } else if (c == ')') {
 568         return (--cp);
 569     } else if (c == '%' && *cp == '<') {
 570         cp = do_if (cp+1);
 571     } else {
 572         CERROR ("'(', '{', '%<' or ')' expected");
 573     }
 574     return (cp);
 575 }
 576
 577 static char *
 578 do_loop(char *sp)
 579 {
 580     register char *cp = sp;
 581     struct format *floop;
 582
 583     floop = next_fp;
 584     cp = compile (cp);
 585     if (*cp++ != ']')
 586         CERROR ("']' expected");
 587
 588     LV(FT_DONE, 1);             /* not yet done */
 589     LV(FT_GOTO, 0);
 590     fp->f_skip = floop - fp;    /* skip backwards */
 591
 592     return cp;
 593 }
 594
 595 static char *
 596 do_if(char *sp)
 597 {
 598     register char *cp = sp;
 599     register struct format *fexpr,
 600                            *fif = (struct format *)NULL;
 601     register int c = '<';
 602
 603     for (;;) {
 604         if (c == '<') {                 /* doing an IF */
 605             if ((c = *cp++) == '{') /*}*/{
 606                 cp = do_name(cp, 0);
 607                 fp->f_type = FT_LS_COMP;
 608                 LV (FT_IF_S, 0);
 609             }
 610             else if (c == '(') {
 611                 cp = do_func(cp);
 612                 /* see if we can merge the load and the "if" */
 613                 if (ftbl->f_type >= IF_FUNCS)
 614                     fp->f_type = ftbl->extra;
 615                 else {
 616                     LV (FT_IF_V_NE, 0);
 617                 }
 618             }
 619             else {
 620                 CERROR("'(' or '{' expected");  /*}*/
 621             }
 622         }
 623
 624         fexpr = fp;                     /* loc of [ELS]IF */
 625         cp = compile (cp);              /* compile IF TRUE stmts */
 626         if (fif)
 627             fif->f_skip = next_fp - fif;
 628
 629         if ((c = *cp++) == '|') {       /* the last ELSE */
 630             LV(FT_GOTO, 0);
 631             fif = fp;                   /* loc of GOTO */
 632             fexpr->f_skip = next_fp - fexpr;
 633
 634             fexpr = (struct format *)NULL;/* no extra ENDIF */
 635
 636             cp = compile (cp);          /* compile ELSE stmts */
 637             fif->f_skip = next_fp - fif;
 638             c = *cp++;
 639         }
 640         else if (c == '?') {            /* another ELSIF */
 641             LV(FT_GOTO, 0);
 642             fif = fp;                   /* loc of GOTO */
 643             fexpr->f_skip = next_fp - fexpr;
 644
 645             c = '<';                    /* impersonate an IF */
 646             continue;
 647         }
 648         break;
 649     }
 650
 651     if (c != '>') {
 652         CERROR("'>' expected.");
 653     }
 654
 655     if (fexpr)                          /* IF ... [ELSIF ...] ENDIF */
 656         fexpr->f_skip = next_fp - fexpr;
 657
 658     return (cp);
 659 }