Apple-2gs-SW/gno
1
0
Fork 0
mirror of https://github.com/GnoConsortium/gno.git synced 2024-11-18 19:09:31 +00:00
Code Issues Projects Releases Wiki Activity
9cdea96615
gno/lib/libc/stdio/vfscanf.c
gdr-ftp 7027be9e4b vfscanf.c: 
- Fixed a problem reported by Derek where stack trashing
	  was happening once an EOF was reached.  This was actually
	  only one example of a class of problems; any time __svfscanf
	  returned before filling all the requested arguments, va_arg
	  was left uncalled for some set of arguments.  This has been
	  fixed by adding a "stack cleanup" section to the code where
	  va_arg is called once for each remaining argument.
	- The __svfscanf routine still had large arrays on the stack.
	  These have been changed to static storage class.  There is
	  currently an assert in place to assure that recursion isn't
	  happening since I didn't have the chance yet to verify in
	  detail the control flow here.  This assert (and the related
	  use of the "recursing" variable) can be removed after such
	  a verification.
1998-03-04 06:20:03 +00:00

946 lines
22 KiB
C
Raw Blame History

/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Torek.
*
* 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.
*/
#ifdef __ORCAC__
segment "libc_stdio";
#endif
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)vfscanf.c 8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <assert.h>
#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif
#include "local.h"
#define FLOATING_POINT
#include "floatio.h"
#define BUF 513 /* Maximum length of numeric string. */
/*
* Flags used during conversion.
*/
#define LONG 0x01 /* l: long or double */
#define LONGDBL 0x02 /* L: long double; unimplemented */
#define SHORT 0x04 /* h: short */
#define SUPPRESS 0x08 /* suppress assignment */
#define POINTER 0x10 /* weird %p pointer (`fake hex') */
#define NOSKIP 0x20 /* do not skip blanks */
/*
* The following are used in numeric conversions only:
* SIGNOK, NDIGITS, DPTOK, and EXPOK are for floating point;
* SIGNOK, NDIGITS, PFXOK, and NZDIGITS are for integral.
*/
#define SIGNOK 0x40 /* +/- is (still) legal */
#define NDIGITS 0x80 /* no digits detected */
#define DPTOK 0x100 /* (float) decimal point is still legal */
#define EXPOK 0x200 /* (float) exponent (e+3, etc) still legal */
#define PFXOK 0x100 /* 0x prefix is (still) legal */
#define NZDIGITS 0x200 /* no zero digits detected */
/*
* Conversion types.
*/
#define CT_CHAR 0 /* %c conversion */
#define CT_CCL 1 /* %[...] conversion */
#define CT_STRING 2 /* %s conversion */
#define CT_INT 3 /* integer, i.e., strtol or strtoul */
#define CT_FLOAT 4 /* floating, i.e., strtod */
#ifdef __GNO__
#define CT_PSTRING 5 /* %b (Pascal-type string) conversion */
#endif
#ifdef __GNO__
typedef struct pString_t {
char p_len;
char p_txt[255];
} pString_t, *pStringPtr_t;
#endif
#define u_char unsigned char
#define u_long unsigned long
static u_char *__sccl(register char *tab, register u_char *fmt);
/*
* We use the EAT_AND_FAIL macro to do some initial cleanup when necessary,
* prior to the final "eating of the extra arguments". This is necessary
* because the number of args eaten is not always consistent when a goto
* is done to input_failure or match_failure.
*
* Regarding the STATIC macro, we want to move large arrays off of the
* stack. At the same time, we don't want to stub our dick doing so, thus
* the checks below. Look for NDEBUG.
*/
#ifdef __ORCAC__
#define EAT_AND_FAIL(label) { (void) va_arg(ap, char *); goto label; }
#define STATIC static
#else
#define EAT_AND_FAIL(label) { goto label; }
#define STATIC
#endif
/*
* vfscanf
*/
int
__svfscanf(register FILE *fp, char const *fmt0, va_list ap)
{
register u_char *fmt = (u_char *)fmt0;
register int c; /* character from format, or conversion */
register size_t width; /* field width, or 0 */
register char *p; /* points into all kinds of strings */
register int n; /* handy integer */
register int flags; /* flags as defined above */
register char *p0; /* saves original value of p when necessary */
int nassigned; /* number of fields assigned */
int nread; /* number of characters consumed from fp */
int base; /* base argument to strtol/strtoul */
u_long (*ccfn)(const char *, char **, int);
/* conversion function (strtol/strtoul) */
STATIC char ccltab[256]; /* character class table for %[...] */
STATIC char buf[BUF]; /* buffer for numeric conversions */
#ifdef __ORCAC__
/*
* The original BSD code has a hidden assumption; it assumes that
* one can avoid calling va_arg() for all passed arguments if the
* results are not needed. This idea has _some_ merit. First it
* is permitted by the ANSI/C standard. Second, it is a reasonable
* assumption if "caller cleans up" is the convention for stack
* usage, especially if args are passed in registers. Finally, it's
* efficient if you can get away with it.
*
* Unfortunately, the combination of "callee cleans up" and a stack
* that can not be easily "unwound" is deadly to ORCA/C; failure
* to call va_arg for each passed pointer will result in stack
* trashing. Therefore, we have a kludge such that if we finish
* prematurely (as defined by how much of the format string we have
* parsed), then we spend extra time parsing the rest of the format
* string, calling va_arg(), and throwing the results away. The
* code to do this starts at the label "eat_args".
*
* The "result" variable is used to maintain the return code in
* these circumstances.
*/
int result;
#endif
#ifndef NDEBUG
#define RETURN(val) { recursing = 0; return val; }
static int recursing = 0;
#else
#define RETURN(val) return val;
#endif
/* `basefix' is used to avoid `if' tests in the integer scanner */
static short basefix[17] =
{ 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
assert(recursing == 0);
#ifndef NDEBUG
recursing = 1;
#endif
nassigned = 0;
nread = 0;
base = 0; /* XXX just to keep gcc happy */
ccfn = NULL; /* XXX just to keep gcc happy */
for (;;) {
c = *fmt++;
/* ORCAC: This is the only "normal" return. */
if (c == 0)
RETURN(nassigned)
if (isspace(c)) {
for (;;) {
if (fp->_r <= 0 && __srefill(fp))
#ifdef __ORCAC__
{
result = nassigned;
goto eat_args;
}
#else
return (nassigned);
#endif
if (!isspace(*fp->_p))
break;
nread++, fp->_r--, fp->_p++;
}
continue;
}
if (c != '%')
goto literal;
width = 0;
flags = 0;
/*
* switch on the format. continue if done;
* break once format type is derived.
*/
again: c = *fmt++;
switch (c) {
case '%':
literal:
if (fp->_r <= 0 && __srefill(fp))
goto input_failure;
if (*fp->_p != c)
goto match_failure;
fp->_r--, fp->_p++;
nread++;
continue;
case '*':
flags |= SUPPRESS;
goto again;
case 'l':
flags |= LONG;
goto again;
case 'L':
flags |= LONGDBL;
goto again;
case 'h':
flags |= SHORT;
goto again;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
width = width * 10 + c - '0';
goto again;
/*
* Conversions.
* Those marked `compat' are for 4.[123]BSD compatibility.
*
* (According to ANSI, E and X formats are supposed
* to the same as e and x. Sorry about that.)
*/
case 'D': /* compat */
flags |= LONG;
/* FALLTHROUGH */
case 'd':
c = CT_INT;
ccfn = (u_long (*)())strtol;
base = 10;
break;
case 'i':
c = CT_INT;
ccfn = (u_long (*)())strtol;
base = 0;
break;
case 'O': /* compat */
flags |= LONG;
/* FALLTHROUGH */
case 'o':
c = CT_INT;
ccfn = strtoul;
base = 8;
break;
case 'u':
c = CT_INT;
ccfn = strtoul;
base = 10;
break;
case 'X': /* compat XXX */
flags |= LONG;
/* FALLTHROUGH */
case 'x':
flags |= PFXOK; /* enable 0x prefixing */
c = CT_INT;
ccfn = strtoul;
base = 16;
break;
#ifdef FLOATING_POINT
case 'E': /* compat XXX */
case 'F': /* compat */
flags |= LONG;
/* FALLTHROUGH */
case 'e': case 'f': case 'g':
c = CT_FLOAT;
break;
#endif
case 's':
c = CT_STRING;
break;
#ifdef __GNO__
case 'b':
c = CT_PSTRING;
break;
#endif
case '[':
fmt = __sccl(ccltab, fmt);
flags |= NOSKIP;
c = CT_CCL;
break;
case 'c':
flags |= NOSKIP;
c = CT_CHAR;
break;
case 'p': /* pointer format is like hex */
flags |= POINTER | PFXOK;
c = CT_INT;
ccfn = strtoul;
base = 16;
break;
case 'n':
if (flags & SUPPRESS) /* ??? */
continue;
if (flags & SHORT)
*va_arg(ap, short *) = nread;
else if (flags & LONG)
*va_arg(ap, long *) = nread;
else
*va_arg(ap, int *) = nread;
continue;
/*
* Disgusting backwards compatibility hacks. XXX
*/
case '\0': /* compat */
#ifdef __ORCAC__
result = EOF;
goto eat_args;
#else
return (EOF);
#endif
default: /* compat */
if (isupper(c))
flags |= LONG;
c = CT_INT;
ccfn = (u_long (*)())strtol;
base = 10;
break;
}
/*
* We have a conversion that requires input.
*/
if (fp->_r <= 0 && __srefill(fp))
EAT_AND_FAIL(input_failure)
/*
* Consume leading white space, except for formats
* that suppress this.
*/
if ((flags & NOSKIP) == 0) {
while (isspace(*fp->_p)) {
nread++;
if (--fp->_r > 0)
fp->_p++;
else if (__srefill(fp))
EAT_AND_FAIL(input_failure)
}
/*
* Note that there is at least one character in
* the buffer, so conversions that do not set NOSKIP
* ca no longer result in an input failure.
*/
}
/*
* Do the conversion.
*/
switch (c) {
case CT_CHAR:
/* scan arbitrary characters (sets NOSKIP) */
if (width == 0)
width = 1;
if (flags & SUPPRESS) {
size_t sum = 0;
for (;;) {
if ((n = fp->_r) < width) {
sum += n;
width -= n;
fp->_p += n;
if (__srefill(fp)) {
if (sum == 0)
goto input_failure;
break;
}
} else {
sum += width;
fp->_r -= width;
fp->_p += width;
break;
}
}
nread += sum;
} else {
size_t r = fread((void *)va_arg(ap, char *), 1,
width, fp);
if (r == 0)
goto input_failure;
nread += r;
nassigned++;
}
break;
case CT_CCL:
/* scan a (nonempty) character class (sets NOSKIP) */
if (width == 0)
width = ~0; /* `infinity' */
/* take only those things in the class */
if (flags & SUPPRESS) {
n = 0;
while (ccltab[*fp->_p]) {
n++, fp->_r--, fp->_p++;
if (--width == 0)
break;
if (fp->_r <= 0 && __srefill(fp)) {
if (n == 0)
goto input_failure;
break;
}
}
if (n == 0)
goto match_failure;
} else {
p0 = p = va_arg(ap, char *);
while (ccltab[*fp->_p]) {
fp->_r--;
*p++ = *fp->_p++;
if (--width == 0)
break;
if (fp->_r <= 0 && __srefill(fp)) {
if (p == p0)
goto input_failure;
break;
}
}
n = p - p0;
if (n == 0)
goto match_failure;
*p = 0;
nassigned++;
}
nread += n;
break;
case CT_STRING:
/* like CCL, but zero-length string OK, & no NOSKIP */
if (width == 0)
width = ~0;
if (flags & SUPPRESS) {
n = 0;
while (!isspace(*fp->_p)) {
n++, fp->_r--, fp->_p++;
if (--width == 0)
break;
if (fp->_r <= 0 && __srefill(fp))
break;
}
nread += n;
} else {
p0 = p = va_arg(ap, char *);
while (!isspace(*fp->_p)) {
fp->_r--;
*p++ = *fp->_p++;
if (--width == 0)
break;
if (fp->_r <= 0 && __srefill(fp))
break;
}
*p = 0;
nread += p - p0;
nassigned++;
}
continue;
#ifdef __GNO__
case CT_PSTRING:
/* like CCL, but zero-length string OK, & no NOSKIP */
/*
* From the ORCA/C ref manual:
* The b format specifier works exactly like the s
* format specifier, except that a string with a
* leading length byte is saved. The string also has
* a null terminator. If the input string is longer
* than 255 characters, the resulting string will be
* n mod 256 characters long, where n is the actual
* number of characters read.
*/
if (width == 0)
width = ~0;
if (flags & SUPPRESS) {
n = 0;
while (!isspace(*fp->_p)) {
n++, fp->_r--, fp->_p++;
if (--width == 0)
break;
if (fp->_r <= 0 && __srefill(fp))
break;
}
nread += n;
} else {
pStringPtr_t ps;
ps = va_arg(ap, pStringPtr_t);
ps->p_len = 0;
p = ps->p_txt;
while (!isspace(*fp->_p)) {
if (ps->p_len == 255) {
/* too long; wrap it */
ps->p_len = 0;
p = ps->p_txt;
nread += 255;
}
fp->_r--;
*p++ = *fp->_p++;
ps->p_len += 1;
if (--width == 0)
break;
if (fp->_r <= 0 && __srefill(fp))
break;
}
*p = 0;
nread += ps->p_len;
nassigned++;
}
continue;
#endif /* __GNO__ */
case CT_INT:
/* scan an integer as if by strtol/strtoul */
#ifdef hardway
if (width == 0 || width > sizeof(buf) - 1)
width = sizeof(buf) - 1;
#else
/* size_t is unsigned, hence this optimisation */
if (--width > sizeof(buf) - 2)
width = sizeof(buf) - 2;
width++;
#endif
flags |= SIGNOK | NDIGITS | NZDIGITS;
for (p = buf; width; width--) {
c = *fp->_p;
/*
* Switch on the character; `goto ok'
* if we accept it as a part of number.
*/
switch (c) {
/*
* The digit 0 is always legal, but is
* special. For %i conversions, if no
* digits (zero or nonzero) have been
* scanned (only signs), we will have
* base==0. In that case, we should set
* it to 8 and enable 0x prefixing.
* Also, if we have not scanned zero digits
* before this, do not turn off prefixing
* (someone else will turn it off if we
* have scanned any nonzero digits).
*/
case '0':
if (base == 0) {
base = 8;
flags |= PFXOK;
}
if (flags & NZDIGITS)
flags &= ~(SIGNOK|NZDIGITS|NDIGITS);
else
flags &= ~(SIGNOK|PFXOK|NDIGITS);
goto ok;
/* 1 through 7 always legal */
case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
base = basefix[base];
flags &= ~(SIGNOK | PFXOK | NDIGITS);
goto ok;
/* digits 8 and 9 ok iff decimal or hex */
case '8': case '9':
base = basefix[base];
if (base <= 8)
break; /* not legal here */
flags &= ~(SIGNOK | PFXOK | NDIGITS);
goto ok;
/* letters ok iff hex */
case 'A': case 'B': case 'C':
case 'D': case 'E': case 'F':
case 'a': case 'b': case 'c':
case 'd': case 'e': case 'f':
/* no need to fix base here */
if (base <= 10)
break; /* not legal here */
flags &= ~(SIGNOK | PFXOK | NDIGITS);
goto ok;
/* sign ok only as first character */
case '+': case '-':
if (flags & SIGNOK) {
flags &= ~SIGNOK;
goto ok;
}
break;
/* x ok iff flag still set & 2nd char */
case 'x': case 'X':
if (flags & PFXOK && p == buf + 1) {
base = 16; /* if %i */
flags &= ~PFXOK;
goto ok;
}
break;
}
/*
* If we got here, c is not a legal character
* for a number. Stop accumulating digits.
*/
break;
ok:
/*
* c is legal: store it and look at the next.
*/
*p++ = c;
if (--fp->_r > 0)
fp->_p++;
else if (__srefill(fp))
break; /* EOF */
}
/*
* If we had only a sign, it is no good; push
* back the sign. If the number ends in `x',
* it was [sign] '0' 'x', so push back the x
* and treat it as [sign] '0'.
*/
if (flags & NDIGITS) {
if (p > buf)
(void) ungetc(*(u_char *)--p, fp);
EAT_AND_FAIL(match_failure)
}
c = ((u_char *)p)[-1];
if (c == 'x' || c == 'X') {
--p;
(void) ungetc(c, fp);
}
if ((flags & SUPPRESS) == 0) {
u_long res;
*p = 0;
res = (*ccfn)(buf, (char **)NULL, base);
if (flags & POINTER)
*va_arg(ap, void **) = (void *)res;
else if (flags & SHORT)
*va_arg(ap, short *) = res;
else if (flags & LONG)
*va_arg(ap, long *) = res;
else
*va_arg(ap, int *) = res;
nassigned++;
}
nread += p - buf;
break;
#ifdef FLOATING_POINT
case CT_FLOAT:
/* scan a floating point number as if by strtod */
#ifdef hardway
if (width == 0 || width > sizeof(buf) - 1)
width = sizeof(buf) - 1;
#else
/* size_t is unsigned, hence this optimisation */
if (--width > sizeof(buf) - 2)
width = sizeof(buf) - 2;
width++;
#endif
flags |= SIGNOK | NDIGITS | DPTOK | EXPOK;
for (p = buf; width; width--) {
c = *fp->_p;
/*
* This code mimicks the integer conversion
* code, but is much simpler.
*/
switch (c) {
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
case '8': case '9':
flags &= ~(SIGNOK | NDIGITS);
goto fok;
case '+': case '-':
if (flags & SIGNOK) {
flags &= ~SIGNOK;
goto fok;
}
break;
case '.':
if (flags & DPTOK) {
flags &= ~(SIGNOK | DPTOK);
goto fok;
}
break;
case 'e': case 'E':
/* no exponent without some digits */
if ((flags&(NDIGITS|EXPOK)) == EXPOK) {
flags =
(flags & ~(EXPOK|DPTOK)) |
SIGNOK | NDIGITS;
goto fok;
}
break;
}
break;
fok:
*p++ = c;
if (--fp->_r > 0)
fp->_p++;
else if (__srefill(fp))
break; /* EOF */
}
/*
* If no digits, might be missing exponent digits
* (just give back the exponent) or might be missing
* regular digits, but had sign and/or decimal point.
*/
if (flags & NDIGITS) {
if (flags & EXPOK) {
/* no digits at all */
while (p > buf)
ungetc(*(u_char *)--p, fp);
EAT_AND_FAIL(match_failure)
}
/* just a bad exponent (e and maybe sign) */
c = *(u_char *)--p;
if (c != 'e' && c != 'E') {
(void) ungetc(c, fp);/* sign */
c = *(u_char *)--p;
}
(void) ungetc(c, fp);
}
if ((flags & SUPPRESS) == 0) {
double res;
*p = 0;
res = strtod(buf,(char **) NULL);
if (flags & LONG)
*va_arg(ap, double *) = res;
else
*va_arg(ap, float *) = res;
nassigned++;
}
nread += p - buf;
break;
#else
#error "we should be using FLOATING_POINT"
#endif /* FLOATING_POINT */
}
}
#ifdef __ORCAC__
input_failure:
result = (nassigned ? nassigned : -1);
goto eat_args;
match_failure:
result = nassigned;
/* FALLTHROUGH */
eat_args:
/* if we get here, fmt is _never_ already pointing to the '\0' char */
while ((c = *fmt++) != 0) {
if (c != '%') {
continue;
}
flags = 0;
eat_again:
c = *fmt++;
switch(c) {
case 0:
/*
* This shouldn't happen; who knows what the stack
* is like if it does. The "--fmt" is basically a
* "return result".
*/
--fmt;
break;
case '%':
break;
case '*':
flags |= SUPPRESS;
goto eat_again;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
case 'l': case 'L': case 'h':
goto eat_again;
case '[':
fmt = __sccl(ccltab, fmt);
/*FALLTHROUGH*/
case 'D': case 'O': case 'X':
case 'd': case 'i': case 'o': case 'u': case 'x':
case 's': case 'c': case 'p': case 'n':
#ifdef FLOATING_POINT
case 'e': case 'f': case 'g':
case 'E': case 'F':
#endif
#ifdef __GNO__
case 'b':
#endif
if ((flags & SUPPRESS) == 0) {
/* throw the result away */
(void) va_arg(ap, char *);
}
break;
}
}
RETURN(result)
#else
input_failure:
return (nassigned ? nassigned : -1);
match_failure:
return (nassigned);
#endif
}
/*
* Fill in the given table from the scanset at the given format
* (just after `['). Return a pointer to the character past the
* closing `]'. The table has a 1 wherever characters should be
* considered part of the scanset.
*/
static u_char *
__sccl(register char *tab, register u_char *fmt)
{
register int c, n, v;
/* first `clear' the whole table */
c = *fmt++; /* first char hat => negated scanset */
if (c == '^') {
v = 1; /* default => accept */
c = *fmt++; /* get new first char */
} else
v = 0; /* default => reject */
/* should probably use memset here */
for (n = 0; n < 256; n++)
tab[n] = v;
if (c == 0)
return (fmt - 1);/* format ended before closing ] */
/*
* Now set the entries corresponding to the actual scanset
* to the opposite of the above.
*
* The first character may be ']' (or '-') without being special;
* the last character may be '-'.
*/
v = 1 - v;
for (;;) {
tab[c] = v; /* take character c */
doswitch:
n = *fmt++; /* and examine the next */
switch (n) {
case 0: /* format ended too soon */
return (fmt - 1);
case '-':
/*
* A scanset of the form
* [01+-]
* is defined as `the digit 0, the digit 1,
* the character +, the character -', but
* the effect of a scanset such as
* [a-zA-Z0-9]
* is implementation defined. The V7 Unix
* scanf treats `a-z' as `the letters a through
* z', but treats `a-a' as `the letter a, the
* character -, and the letter a'.
*
* For compatibility, the `-' is not considerd
* to define a range if the character following
* it is either a close bracket (required by ANSI)
* or is not numerically greater than the character
* we just stored in the table (c).
*/
n = *fmt;
if (n == ']' || n < c) {
c = '-';
break; /* resume the for(;;) */
}
fmt++;
do { /* fill in the range */
tab[++c] = v;
} while (c < n);
#if 1 /* XXX another disgusting compatibility hack */
/*
* Alas, the V7 Unix scanf also treats formats
* such as [a-c-e] as `the letters a through e'.
* This too is permitted by the standard....
*/
goto doswitch;
#else
c = *fmt++;
if (c == 0)
return (fmt - 1);
if (c == ']')
return (fmt);
#endif
break;
case ']': /* end of scanset */
return (fmt);
default: /* just another character */
c = n;
break;
}
}
/* NOTREACHED */
}
Reference in New Issue View Git Blame Copy Permalink