streamsize basic_streambuf<char, char_traits<char> > ::xsgetn(char* s, streamsize n) { streamsize result = 0; const int_type eof = traits_type::eof(); while (result < n) { if (_FILE_I_avail(_M_get) > 0) { size_t chunk = min(__STATIC_CAST(size_t,_FILE_I_avail(_M_get)), __STATIC_CAST(size_t,n - result)); traits_type::copy(s, _FILE_I_next(_M_get), chunk); result += chunk; s += chunk; _FILE_I_bump(_M_get, chunk); } else { int_type c = sbumpc(); if (c != eof) { s[result] = c; ++result; ++s; } else break; } } return result; }
streamsize streambuf::xsgetn(char_type* __buf, streamsize __buf_size) { streamsize __get_count = 0; while (__get_count < __buf_size) { if (__M_gnext < __M_gend) { size_t __chunk = min(static_cast<size_t>(__M_gend - __M_gnext), static_cast<size_t>(__buf_size - __get_count)); VOS_memcpy_s(__buf, __buf_size - __get_count, __M_gnext, __chunk); __get_count += __chunk; __buf += __chunk; __M_gnext += __chunk; } else { int_type __char = sbumpc(); if (__char != EOF) { *__buf = static_cast<char>(__char); ++__get_count; ++__buf; } else { break; } } } return __get_count; }
int streambuf::snextc() { #if defined(OS_INCLUDE_STREAMBUF_BUFFERS) if (sbumpc() == traits::eof()) { return traits::eof(); } #endif return sgetc(); }
void FileContainer::read(char& character) { if (sgetc() != EOF) { character = sbumpc(); } else { // Error EOF } }
int streambuf::vscan(char const *fmt0, _G_va_list ap, ios *stream /* = NULL */) { register const u_char *fmt = (const 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 */ // Assignments to base and ccfn are just to suppress warnings from gcc. int base = 0; /* base argument to strtol/strtoul */ typedef u_long (*strtoulfn)(const char*, char**, int); strtoulfn ccfn = 0; // conversion function (strtol/strtoul) char ccltab[256]; /* character class table for %[...] */ char buf[BUF]; /* buffer for numeric conversions */ int seen_eof = 0; /* `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 }; nassigned = 0; nread = 0; for (;;) { c = *fmt++; if (c == 0) goto done; if (isspace(c)) { for (;;) { c = sbumpc(); if (c == EOF) goto eof_failure; if (!isspace(c)) { sputbackc(c); break; } nread++; } 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: n = sbumpc(); if (n == EOF) goto eof_failure; if (n != c) { sputbackc(n); goto match_failure; } 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 = (strtoulfn)strtol; base = 10; break; case 'i': c = CT_INT; ccfn = (strtoulfn)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': case 'x': flags |= PFXOK; /* enable 0x prefixing */ c = CT_INT; ccfn = strtoul; base = 16; break; #ifdef FLOATING_POINT case 'E': case 'F': case 'e': case 'f': case 'g': c = CT_FLOAT; break; #endif case 's': c = CT_STRING; break; 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 */ nassigned = EOF; goto done; default: /* compat */ if (isupper(c)) flags |= LONG; c = CT_INT; ccfn = (strtoulfn)strtol; base = 10; break; } /* * We have a conversion that requires input. */ if (sgetc() == EOF) goto eof_failure; /* * Consume leading white space, except for formats * that suppress this. */ if ((flags & NOSKIP) == 0) { n = (unsigned char)*_gptr; while (isspace(n)) { _gptr++; nread++; n = sgetc(); if (n == EOF) goto eof_failure; } // Note that there is at least one character in // the buffer, so conversions that do not set NOSKIP // can no longer result in an input failure. } /* * Do the conversion. */ switch (c) { case CT_CHAR: /* scan arbitrary characters (sets NOSKIP) */ if (width == 0) // FIXME! width = 1; if (flags & SUPPRESS) { size_t sum = 0; for (;;) { if ((n = _egptr - _gptr) < (int)width) { sum += n; width -= n; _gptr += n; if (underflow() == EOF) if (sum == 0) goto eof_failure; else { seen_eof++; break; } } else { sum += width; _gptr += width; break; } } nread += sum; } else { size_t r = sgetn((char*)va_arg(ap, char*), width); if (r != width) goto eof_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[(unsigned char)*_gptr]) { n++, _gptr++; if (--width == 0) break; if (sgetc() == EOF) { if (n == 0) goto eof_failure; seen_eof++; break; } } if (n == 0) goto match_failure; } else { p0 = p = va_arg(ap, char *); while (ccltab[(unsigned char)*_gptr]) { *p++ = *_gptr++; if (--width == 0) break; if (sgetc() == EOF) { if (p == p0) goto eof_failure; seen_eof++; 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((unsigned char)*_gptr)) { n++, _gptr++; if (--width == 0) break; if (sgetc() == EOF) { seen_eof++; break; } } nread += n; } else { p0 = p = va_arg(ap, char *); while (!isspace((unsigned char)*_gptr)) { *p++ = *_gptr++; if (--width == 0) break; if (sgetc() == EOF) { seen_eof++; break; } } *p = 0; nread += p - p0; nassigned++; } continue; case CT_INT: /* scan an integer as if by strtol/strtoul */ if (width == 0 || width > sizeof(buf) - 1) width = sizeof(buf) - 1; flags |= SIGNOK | NDIGITS | NZDIGITS; for (p = buf; width; width--) { c = (unsigned char)*_gptr; /* * 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; _gptr++; if (sgetc() == EOF) { seen_eof++; 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) sputbackc(*(u_char *)--p); goto match_failure; } c = ((u_char *)p)[-1]; if (c == 'x' || c == 'X') { --p; (void) sputbackc(c); } 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 */ if (width == 0 || width > sizeof(buf) - 1) width = sizeof(buf) - 1; flags |= SIGNOK | NDIGITS | DPTOK | EXPOK; for (p = buf; width; width--) { c = (unsigned char)*_gptr; /* * 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; _gptr++; if (sgetc() == EOF) { seen_eof++; 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) sputbackc(*(u_char *)--p); goto match_failure; } /* just a bad exponent (e and maybe sign) */ c = *(u_char *)--p; if (c != 'e' && c != 'E') { (void)sputbackc(c);/* sign */ c = *(u_char *)--p; } (void) sputbackc(c); } if ((flags & SUPPRESS) == 0) { double res; *p = 0; #ifdef USE_DTOA res = strtod(buf, NULL); #else res = atof(buf); #endif if (flags & LONG) *va_arg(ap, double *) = res; else *va_arg(ap, float *) = res; nassigned++; } nread += p - buf; break; #endif /* FLOATING_POINT */ } } eof_failure: seen_eof++; input_failure: if (nassigned == 0) nassigned = -1; match_failure: if (stream) stream->set(ios::failbit); done: if (stream && seen_eof) stream->set(ios::eofbit); return (nassigned); }