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added "%b" specifier (Apple IIgs specific) for Pascal-type strings

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gdr 1997-10-30 04:49:02 +00:00
parent 2b38da3926
commit 88223ca717
1 changed files with 69 additions and 0 deletions
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69
lib/libc/stdio/vfscanf.c
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@ -89,6 +89,16 @@ static char sccsid[] = "@(#)vfscanf.c 8.1 (Berkeley) 6/4/93";
#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
@ -237,6 +247,12 @@ literal:
c = CT_STRING;
break;
#ifdef __GNO__
case 'b':
c = CT_PSTRING;
break;
#endif
case '[':
fmt = __sccl(ccltab, fmt);
flags |= NOSKIP;
@ -417,6 +433,59 @@ literal:
}
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