848fd5ae5b
Add a helper for allocating an array and initialize the elements to zero. This is analogous to CALLOC_ARRAY() in the rest of the codebase but it returns NULL on allocation failures rather than dying to accommodate other users of libxdiff such as libgit2. Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk> Signed-off-by: Junio C Hamano <gitster@pobox.com>
62 lines
2.1 KiB
C
62 lines
2.1 KiB
C
/*
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* LibXDiff by Davide Libenzi ( File Differential Library )
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* Copyright (C) 2003 Davide Libenzi
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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 Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see
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* <http://www.gnu.org/licenses/>.
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*
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* Davide Libenzi <davidel@xmailserver.org>
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*
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*/
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#if !defined(XMACROS_H)
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#define XMACROS_H
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#define XDL_MIN(a, b) ((a) < (b) ? (a): (b))
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#define XDL_MAX(a, b) ((a) > (b) ? (a): (b))
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#define XDL_ABS(v) ((v) >= 0 ? (v): -(v))
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#define XDL_ISDIGIT(c) ((c) >= '0' && (c) <= '9')
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#define XDL_ISSPACE(c) (isspace((unsigned char)(c)))
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#define XDL_ADDBITS(v,b) ((v) + ((v) >> (b)))
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#define XDL_MASKBITS(b) ((1UL << (b)) - 1)
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#define XDL_HASHLONG(v,b) (XDL_ADDBITS((unsigned long)(v), b) & XDL_MASKBITS(b))
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#define XDL_LE32_PUT(p, v) \
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do { \
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unsigned char *__p = (unsigned char *) (p); \
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*__p++ = (unsigned char) (v); \
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*__p++ = (unsigned char) ((v) >> 8); \
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*__p++ = (unsigned char) ((v) >> 16); \
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*__p = (unsigned char) ((v) >> 24); \
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} while (0)
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#define XDL_LE32_GET(p, v) \
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do { \
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unsigned char const *__p = (unsigned char const *) (p); \
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(v) = (unsigned long) __p[0] | ((unsigned long) __p[1]) << 8 | \
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((unsigned long) __p[2]) << 16 | ((unsigned long) __p[3]) << 24; \
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} while (0)
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/* Allocate an array of nr elements, returns NULL on failure */
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#define XDL_ALLOC_ARRAY(p, nr) \
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((p) = SIZE_MAX / sizeof(*(p)) >= (size_t)(nr) \
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? xdl_malloc((nr) * sizeof(*(p))) \
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: NULL)
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/* Allocate an array of nr zeroed out elements, returns NULL on failure */
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#define XDL_CALLOC_ARRAY(p, nr) ((p) = xdl_calloc(nr, sizeof(*(p))))
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#endif /* #if !defined(XMACROS_H) */
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