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68a423ab3e
We ask to write 41 bytes and make sure that the return value is at least 41. This is the same "dangerous" pattern that was fixed in the prior commit (wherein a negative return value is promoted to unsigned), though it is not dangerous here because our "41" is a constant, not an unsigned variable. But we should convert it anyway to avoid modeling a dangerous construct. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
40 lines
959 B
C
40 lines
959 B
C
/*
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* Copyright (c) 2005, 2006 Rene Scharfe
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*/
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#include "cache.h"
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#include "commit.h"
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#include "tar.h"
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#include "builtin.h"
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#include "quote.h"
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static const char builtin_get_tar_commit_id_usage[] =
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"git get-tar-commit-id";
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/* ustar header + extended global header content */
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#define RECORDSIZE (512)
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#define HEADERSIZE (2 * RECORDSIZE)
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int cmd_get_tar_commit_id(int argc, const char **argv, const char *prefix)
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{
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char buffer[HEADERSIZE];
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struct ustar_header *header = (struct ustar_header *)buffer;
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char *content = buffer + RECORDSIZE;
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const char *comment;
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ssize_t n;
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if (argc != 1)
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usage(builtin_get_tar_commit_id_usage);
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n = read_in_full(0, buffer, HEADERSIZE);
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if (n < HEADERSIZE)
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die("git get-tar-commit-id: read error");
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if (header->typeflag[0] != 'g')
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return 1;
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if (!skip_prefix(content, "52 comment=", &comment))
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return 1;
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if (write_in_full(1, comment, 41) < 0)
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die_errno("git get-tar-commit-id: write error");
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return 0;
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}
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