/*- * Copyright (c) 1979, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint static char sccsid[] = "@(#)READ8.c 8.1 (Berkeley) 6/6/93"; #endif /* not lint */ #include "h00vars.h" #include <errno.h> extern int errno; double READ8(curfile) register struct iorec *curfile; { double data; int retval; if (curfile->funit & FWRITE) { ERROR("%s: Attempt to read, but open for writing\n", curfile->pfname); } UNSYNC(curfile); errno = 0; retval = readreal(curfile, &data); if (retval == EOF) { ERROR("%s: Tried to read past end of file\n", curfile->pfname); } if (retval == 0) { ERROR("%s: Bad data found on real read\n", curfile->pfname); } if (errno == ERANGE) { if (data == 0.0) ERROR("%s: Underflow on real read\n", curfile->pfname); else ERROR("%s: Overflow on real read\n", curfile->pfname); } if (errno != 0) { PERROR("Error encountered on real read ", curfile->pfname); } return (data); } /* * given a file pointer, read a sequence of characters of the * syntax of section 6.1.5 and form them into a double. * * the syntax of a signed-real is: * [-|+] digit {digit} [ . digit {digit} ] [ e [+|-] digit {digit} ] * * returns: * 1 for success (with value in *doublep) * 0 on error (with *doublep unchanged) * -1 on end-of-file during read (with *doublep unchanged) * side effects: * errno may be set to ERANGE if atof() sets it. */ readreal(curfile, doublep) struct iorec *curfile; double *doublep; { FILE *filep = curfile->fbuf; /* current file variable */ char *sequencep; /* a pointer into sequence */ int read; /* return value from fscanf() */ char sequence[BUFSIZ]; /* the character sequence */ double atof(); #define PUSHBACK(curfile, sequencep) \ if (ungetc(*--(sequencep), (curfile)->fbuf) != EOF) { \ *(sequencep) = '\0'; \ } else if ((curfile)->funit & SYNC) { \ (curfile)->funit &= ~SYNC; \ *(curfile)->fileptr = *(sequencep); \ *(sequencep) = '\0'; \ } else { \ return (0); \ } #define RETURN_ON_EOF(read) \ if (read == EOF) \ return (EOF); \ else \ /* void */; #define PUSH_TO_NULL(sequencep) \ while (*sequencep) \ sequencep++; /* general reader of the next character */ #define NEXT_CHAR(read, filep, format, sequencep) \ read = fscanf(filep, "%c", sequencep); \ RETURN_ON_EOF(read); \ *++sequencep = '\0'; /* e.g. use %[0123456789] for {digit}, and check read */ #define SOME(read, filep, format, sequencep) \ read = fscanf(filep, format, sequencep); \ RETURN_ON_EOF(read); \ PUSH_TO_NULL(sequencep); /* e.g. use %[0123456789] for digit {digit} */ #define AT_LEAST_ONE(read, filep, format, sequencep) \ read = fscanf(filep, format, sequencep); \ RETURN_ON_EOF(read); \ if (strlen(sequencep) < 1) \ return (0); \ PUSH_TO_NULL(sequencep); #define ANY_ONE_OF(read, filep, format, sequencep) \ read = fscanf(filep, format, sequencep); \ RETURN_ON_EOF(read); \ if (strlen(sequencep) != 1) \ return (0); \ PUSH_TO_NULL(sequencep); #define AT_MOST_ONE(read, filep, format, sequencep) \ read = fscanf(filep, format, sequencep); \ RETURN_ON_EOF(read); \ if (strlen(sequencep) > 1) \ return (0); \ PUSH_TO_NULL(sequencep); sequencep = &sequence[0]; *sequencep = '\0'; /* * skip leading whitespace */ SOME(read, filep, "%*[ \t\n]", sequencep); /* * this much is required: * [ "+" | "-" ] digit {digits} */ AT_MOST_ONE(read, filep, "%[+-]", sequencep); AT_LEAST_ONE(read, filep, "%[0123456789]", sequencep); /* * any of this is optional: * [ `.' digit {digit} ] [ `e' [ `+' | `-' ] digit {digits} ] */ NEXT_CHAR(read, filep, "%c", sequencep); switch (sequencep[-1]) { default: PUSHBACK(curfile, sequencep); goto convert; case '.': SOME(read, filep, "%[0123456789]", sequencep); if (!read) { PUSHBACK(curfile, sequencep); goto convert; } NEXT_CHAR(read, filep, "%c", sequencep); if (sequencep[-1] != 'e') { PUSHBACK(curfile, sequencep); goto convert; } /* fall through */ case 'e': NEXT_CHAR(read, filep, "%c", sequencep); if (sequencep[-1] != '+' && sequencep[-1] != '-') { PUSHBACK(curfile, sequencep); SOME(read, filep, "%[0123456789]", sequencep); if (!read) PUSHBACK(curfile, sequencep); goto convert; } SOME(read, filep, "%[0123456789]", sequencep); if (!read) { PUSHBACK(curfile, sequencep); PUSHBACK(curfile, sequencep); } } convert: /* * convert sequence to double */ *doublep = atof(&sequence[0]); return (1); }