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      { "unquote",   TF_EXPR,    FT_LS_UNQUOTE,  0,              TFL_PUTS},
 153
 154      { NULL,         0,         0,              0,              0 }
 155 };
 156
 157 /* Add new component to the hash table */
 158 #define NEWCOMP(cm,name)\
 159         cm = ((struct comp *) calloc(1, sizeof (struct comp)));\
 160         cm->c_name = name;\
 161         ncomp++;\
 162         i = CHASH(name);\
 163         cm->c_next = wantcomp[i];\
 164         wantcomp[i] = cm;
 165
 166 #define NEWFMT (next_fp++)
 167 #define NEW(type,fill,wid)\
 168         fp=NEWFMT; fp->f_type=(type); fp->f_fill=(fill); fp->f_width=(wid);
 169
 170 /* Add (possibly new) component to the hash table */
 171 #define ADDC(name)\
 172         FINDCOMP(cm, name);\
 173         if (!cm) {\
 174             NEWCOMP(cm,name);\
 175         }\
 176         fp->f_comp = cm;
 177
 178 #define LV(type, value)         NEW(type,0,0); fp->f_value = (value);
 179 #define LS(type, str)           NEW(type,0,0); fp->f_text = (str);
 180
 181 #define PUTCOMP(comp)           NEW(FT_COMP,0,0); ADDC(comp);
 182 #define PUTLIT(str)             NEW(FT_LIT,0,0); fp->f_text = (str);
 183 #define PUTC(c)                 NEW(FT_CHAR,0,0); fp->f_char = (c);
 184
 185 static char *format_string;
 186 static unsigned char *usr_fstring;      /* for CERROR */
 187
 188 #define CERROR(str) compile_error (str, cp)
 189
 190 /*
 191  * external prototypes
 192  */
 193 extern char *getusername(void);
 194
 195 /*
 196  * static prototypes
 197  */
 198 static struct ftable *lookup(char *);
 199 static void compile_error(char *, char *);
 200 static char *compile (char *);
 201 static char *do_spec(char *);
 202 static char *do_name(char *, int);
 203 static char *do_func(char *);
 204 static char *do_expr (char *, int);
 205 static char *do_loop(char *);
 206 static char *do_if(char *);
 207
 208
 209 static struct ftable *
 210 lookup(char *name)
 211 {
 212     register struct ftable *t = functable;
 213     register char *nm;
 214     register char c = *name;
 215
 216     while ((nm = t->name)) {
 217         if (*nm == c && strcmp (nm, name) == 0)
 218             return (ftbl = t);
 219
 220         t++;
 221     }
 222     return (struct ftable *) 0;
 223 }
 224
 225
 226 static void
 227 compile_error(char *str, char *cp)
 228 {
 229     int i, errpos, errctx;
 230
 231     errpos = cp - format_string;
 232     errctx = errpos > 20 ? 20 : errpos;
 233     usr_fstring[errpos] = '\0';
 234
 235     for (i = errpos-errctx; i < errpos; i++) {
 236 #ifdef LOCALE
 237         if (iscntrl(usr_fstring[i]))
 238 #else
 239         if (usr_fstring[i] < 32)
 240 #endif
 241             usr_fstring[i] = '_';
 242     }
 243
 244     advise(NULL, "\"%s\": format compile error - %s",
 245            &usr_fstring[errpos-errctx], str);
 246     adios (NULL, "%*s", errctx+1, "^");
 247 }
 248
 249 /*
 250  * Compile format string "fstring" into format list "fmt".
 251  * Return the number of header components found in the format
 252  * string.
 253  */
 254
 255 int
 256 fmt_compile(char *fstring, struct format **fmt)
 257 {
 258     register char *cp;
 259     int i;
 260
 261     if (format_string)
 262         free (format_string);
 263     format_string = getcpy (fstring);
 264     usr_fstring = fstring;
 265
 266     /* init the component hash table. */
 267     for (i = 0; i < sizeof(wantcomp)/sizeof(wantcomp[0]); i++)
 268         wantcomp[i] = 0;
 269
 270     memset((char *) &fmt_mnull, 0, sizeof(fmt_mnull));
 271
 272     /* it takes at least 4 char to generate one format so we
 273      * allocate a worst-case format array using 1/4 the length
 274      * of the format string.  We actually need twice this much
 275      * to handle both pre-processing (e.g., address parsing) and
 276      * normal processing.
 277      */
 278     i = strlen(fstring)/2 + 1;
 279                 if (i==1) i++;
 280     next_fp = formatvec = (struct format *)calloc ((size_t) i,
 281                                                    sizeof(struct format));
 282     if (next_fp == NULL)
 283         adios (NULL, "unable to allocate format storage");
 284
 285     ncomp = 0;
 286     infunction = 0;
 287
 288     cp = compile(format_string);
 289     if (*cp) {
 290         CERROR("extra '%>', '%|' or '%?'");
 291     }
 292     LV(FT_DONE, 0);             /* really done */
 293     *fmt = formatvec;
 294
 295     return (ncomp);
 296 }
 297
 298 static char *
 299 compile (char *sp)
 300 {
 301     register char *cp = sp;
 302     register int  c;
 303
 304     for (;;) {
 305         sp = cp;
 306         while ((c = *cp) && c != '%')
 307             cp++;
 308         *cp = 0;
 309         switch (cp-sp) {
 310         case 0:
 311             break;
 312         case 1:
 313             PUTC(*sp);
 314             break;
 315         default:
 316             PUTLIT(sp);
 317             break;
 318         }
 319         if (c == 0)
 320             return (cp);
 321
 322         switch (c = *++cp) {
 323         case '%':
 324             PUTC (*cp);
 325             cp++;
 326             break;
 327
 328         case '|':
 329         case '>':
 330         case '?':
 331         case ']':
 332             return (cp);
 333
 334         case '<':
 335             cp = do_if(++cp);
 336             break;
 337
 338         case '[':       /* ] */
 339             cp = do_loop(++cp);
 340             break;
 341
 342         case ';':       /* comment line */
 343             cp++;
 344             while ((c = *cp++) && c != '\n')
 345                 continue;
 346             break;
 347
 348         default:
 349             cp = do_spec(cp);
 350             break;
 351         }
 352     }
 353 }
 354
 355
 356 static char *
 357 do_spec(char *sp)
 358 {
 359     register char *cp = sp;
 360     register int c;
 361 #ifndef lint
 362     register int ljust = 0;
 363 #endif  /* not lint */
 364     register int wid = 0;
 365     register char fill = ' ';
 366
 367     c = *cp++;
 368     if (c == '-') {
 369         ljust++;
 370         c = *cp++;
 371     }
 372     if (c == '0') {
 373         fill = c;
 374         c = *cp++;
 375     }
 376     while (isdigit(c)) {
 377         wid = wid*10 + (c - '0');
 378         c = *cp++;
 379     }
 380     if (c == '{') {
 381         cp = do_name(cp, 0);
 382         if (! infunction)
 383             fp->f_type = wid? FT_COMPF : FT_COMP;
 384     }
 385     else if (c == '(') {
 386         cp = do_func(cp);
 387         if (! infunction) {
 388             if (ftbl->flags & TFL_PUTS) {
 389                 LV( wid? FT_STRF : FT_STR, ftbl->extra);
 390             }
 391             else if (ftbl->flags & TFL_PUTN) {
 392                 LV( wid? FT_NUMF : FT_NUM, ftbl->extra);
 393             }
 394         }
 395     }
 396     else {
 397         CERROR("component or function name expected");
 398     }
 399     if (ljust)
 400         wid = -wid;
 401     fp->f_width = wid;
 402     fp->f_fill = fill;
 403
 404     return (cp);
 405 }
 406
 407 static char *
 408 do_name(char *sp, int preprocess)
 409 {
 410     register char *cp = sp;
 411     register int c;
 412     register int i;
 413     static int primed = 0;
 414
 415     while (isalnum(c = *cp++) || c == '-' || c == '_')
 416         ;
 417     if (c != '}') {
 418         CERROR("'}' expected");
 419     }
 420     cp[-1] = '\0';
 421     PUTCOMP(sp);
 422     switch (preprocess) {
 423
 424     case FT_PARSEDATE:
 425         if (cm->c_type & CT_ADDR) {
 426             CERROR("component used as both date and address");
 427         }
 428         cm->c_tws = (struct tws *)
 429             calloc((size_t) 1, sizeof(*cm->c_tws));
 430         fp->f_type = preprocess;
 431         PUTCOMP(sp);
 432         cm->c_type |= CT_DATE;
 433         break;
 434
 435     case FT_MYMBOX:
 436         if (!primed) {
 437             ismymbox ((struct mailname *) 0);
 438             primed++;
 439         }
 440         /* fall through */
 441     case FT_PARSEADDR:
 442         if (cm->c_type & CT_DATE) {
 443             CERROR("component used as both date and address");
 444         }
 445         cm->c_mn = &fmt_mnull;
 446         fp->f_type = preprocess;
 447         PUTCOMP(sp);
 448         cm->c_type |= CT_ADDR;
 449         break;
 450
 451     case FT_FORMATADDR:
 452         if (cm->c_type & CT_DATE) {
 453             CERROR("component used as both date and address");
 454         }
 455         cm->c_type |= CT_ADDR;
 456         break;
 457     }
 458     return (cp);
 459 }
 460
 461 static char *
 462 do_func(char *sp)
 463 {
 464     register char *cp = sp;
 465     register int c;
 466     register struct ftable *t;
 467     register int n;
 468     int mflag;          /* minus sign in NUM */
 469
 470     infunction++;
 471
 472     while (isalnum(c = *cp++))
 473         ;
 474     if (c != '(' && c != '{' && c != ' ' && c != ')') {
 475         CERROR("'(', '{', ' ' or ')' expected");
 476     }
 477     cp[-1] = '\0';
 478     if ((t = lookup (sp)) == 0) {
 479         CERROR("unknown function");
 480     }
 481     if (isspace(c))
 482         c = *cp++;
 483
 484     switch (t->type) {
 485
 486     case TF_COMP:
 487         if (c != '{') {
 488             CERROR("component name expected");
 489         }
 490         cp = do_name(cp, t->extra);
 491         fp->f_type = t->f_type;
 492         c = *cp++;
 493         break;
 494
 495     case TF_NUM:
 496         if ((mflag = (c == '-')))
 497             c = *cp++;
 498         n = 0;
 499         while (isdigit(c)) {
 500             n = n*10 + (c - '0');
 501             c = *cp++;
 502         }
 503         if (mflag)
 504             n = (-n);
 505         LV(t->f_type,n);
 506         break;
 507
 508     case TF_STR:
 509         sp = cp - 1;
 510         while (c && c != ')')
 511             c = *cp++;
 512         cp[-1] = '\0';
 513         LS(t->f_type,sp);
 514         break;
 515
 516     case TF_NONE:
 517         LV(t->f_type,t->extra);
 518         break;
 519
 520     case TF_MYBOX:
 521         LS(t->f_type, getusername());
 522         break;
 523
 524     case TF_NOW:
 525         LV(t->f_type, time((time_t *) 0));
 526         break;
 527
 528     case TF_EXPR_SV:
 529         LV(FT_SAVESTR, 0);
 530         /* fall through */
 531     case TF_EXPR:
 532         *--cp = c;
 533         cp = do_expr(cp, t->extra);
 534         LV(t->f_type, 0);
 535         c = *cp++;
 536         ftbl = t;
 537         break;
 538
 539     case TF_NOP:
 540         *--cp = c;
 541         cp = do_expr(cp, t->extra);
 542         c = *cp++;
 543         ftbl = t;
 544         break;
 545     }
 546     if (c != ')') {
 547         CERROR("')' expected");
 548     }
 549     --infunction;
 550     return (cp);
 551 }
 552
 553 static char *
 554 do_expr (char *sp, int preprocess)
 555 {
 556     register char *cp = sp;
 557     register int  c;
 558
 559     if ((c = *cp++) == '{') {
 560         cp = do_name (cp, preprocess);
 561         fp->f_type = FT_LS_COMP;
 562     } else if (c == '(') {
 563         cp = do_func (cp);
 564     } else if (c == ')') {
 565         return (--cp);
 566     } else if (c == '%' && *cp == '<') {
 567         cp = do_if (cp+1);
 568     } else {
 569         CERROR ("'(', '{', '%<' or ')' expected");
 570     }
 571     return (cp);
 572 }
 573
 574 static char *
 575 do_loop(char *sp)
 576 {
 577     register char *cp = sp;
 578     struct format *floop;
 579
 580     floop = next_fp;
 581     cp = compile (cp);
 582     if (*cp++ != ']')
 583         CERROR ("']' expected");
 584
 585     LV(FT_DONE, 1);             /* not yet done */
 586     LV(FT_GOTO, 0);
 587     fp->f_skip = floop - fp;    /* skip backwards */
 588
 589     return cp;
 590 }
 591
 592 static char *
 593 do_if(char *sp)
 594 {
 595     register char *cp = sp;
 596     register struct format *fexpr,
 597                            *fif = (struct format *)NULL;
 598     register int c = '<';
 599
 600     for (;;) {
 601         if (c == '<') {                 /* doing an IF */
 602             if ((c = *cp++) == '{') /*}*/{
 603                 cp = do_name(cp, 0);
 604                 fp->f_type = FT_LS_COMP;
 605                 LV (FT_IF_S, 0);
 606             }
 607             else if (c == '(') {
 608                 cp = do_func(cp);
 609                 /* see if we can merge the load and the "if" */
 610                 if (ftbl->f_type >= IF_FUNCS)
 611                     fp->f_type = ftbl->extra;
 612                 else {
 613                     LV (FT_IF_V_NE, 0);
 614                 }
 615             }
 616             else {
 617                 CERROR("'(' or '{' expected");  /*}*/
 618             }
 619         }
 620
 621         fexpr = fp;                     /* loc of [ELS]IF */
 622         cp = compile (cp);              /* compile IF TRUE stmts */
 623         if (fif)
 624             fif->f_skip = next_fp - fif;
 625
 626         if ((c = *cp++) == '|') {       /* the last ELSE */
 627             LV(FT_GOTO, 0);
 628             fif = fp;                   /* loc of GOTO */
 629             fexpr->f_skip = next_fp - fexpr;
 630
 631             fexpr = (struct format *)NULL;/* no extra ENDIF */
 632
 633             cp = compile (cp);          /* compile ELSE stmts */
 634             fif->f_skip = next_fp - fif;
 635             c = *cp++;
 636         }
 637         else if (c == '?') {            /* another ELSIF */
 638             LV(FT_GOTO, 0);
 639             fif = fp;                   /* loc of GOTO */
 640             fexpr->f_skip = next_fp - fexpr;
 641
 642             c = '<';                    /* impersonate an IF */
 643             continue;
 644         }
 645         break;
 646     }
 647
 648     if (c != '>') {
 649         CERROR("'>' expected.");
 650     }
 651
 652     if (fexpr)                          /* IF ... [ELSIF ...] ENDIF */
 653         fexpr->f_skip = next_fp - fexpr;
 654
 655     return (cp);
 656 }