65 lines
1.9 KiB
C
65 lines
1.9 KiB
C
// This is part of the iostream library, providing input/output for C++.
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// Copyright (C) 1991 Per Bothner.
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public
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// License along with this library; if not, write to the Free
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// Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#include "ioprivate.h"
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// Algorithm based on that used by Berkeley pre-4.4 fgets implementation.
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// Read chars into buf (of size n), until delim is seen.
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// Return number of chars read (at most n-1).
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// If extract_delim < 0, leave delimiter unread.
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// If extract_delim > 0, insert delim in output.
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long streambuf::sgetline(char* buf, size_t n, char delim, int extract_delim)
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{
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register char *ptr = buf;
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if (n <= 0)
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return EOF;
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n--; // Leave space for final '\0'.
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do {
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int len = egptr() - gptr();
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if (len <= 0)
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if (underflow() == EOF)
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break;
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else
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len = egptr() - gptr();
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if (len >= (int)n)
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len = n;
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char *t = (char*)memchr((void*)_gptr, delim, len);
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if (t != NULL) {
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size_t old_len = ptr-buf;
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len = t - _gptr;
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if (extract_delim >= 0) {
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t++;
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old_len++;
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if (extract_delim > 0)
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len++;
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}
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memcpy((void*)ptr, (void*)_gptr, len);
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ptr[len] = 0;
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_gptr = t;
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return old_len + len;
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}
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memcpy((void*)ptr, (void*)_gptr, len);
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_gptr += len;
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ptr += len;
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n -= len;
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} while (n != 0);
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*ptr = 0;
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return ptr - buf;
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}
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