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Annotation of mandoc/dba_write.c, Revision 1.1

1.1     ! schwarze    1: /*     $Id$ */
        !             2: /*
        !             3:  * Copyright (c) 2016 Ingo Schwarze <schwarze@openbsd.org>
        !             4:  *
        !             5:  * Permission to use, copy, modify, and distribute this software for any
        !             6:  * purpose with or without fee is hereby granted, provided that the above
        !             7:  * copyright notice and this permission notice appear in all copies.
        !             8:  *
        !             9:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
        !            10:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
        !            11:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
        !            12:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
        !            13:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
        !            14:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
        !            15:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
        !            16:  *
        !            17:  * Low-level functions for serializing allocation-based data to disk.
        !            18:  * The interface is defined in "dba_write.h".
        !            19:  */
        !            20: #include <assert.h>
        !            21: #include <endian.h>
        !            22: #include <err.h>
        !            23: #include <errno.h>
        !            24: #include <fcntl.h>
        !            25: #include <stdint.h>
        !            26: #include <stdio.h>
        !            27:
        !            28: #include "dba_write.h"
        !            29:
        !            30: static FILE    *ofp;
        !            31:
        !            32:
        !            33: int
        !            34: dba_open(const char *fname)
        !            35: {
        !            36:        ofp = fopen(fname, "w");
        !            37:        return ofp == NULL ? -1 : 0;
        !            38: }
        !            39:
        !            40: int
        !            41: dba_close(void)
        !            42: {
        !            43:        return fclose(ofp) == EOF ? -1 : 0;
        !            44: }
        !            45:
        !            46: int32_t
        !            47: dba_tell(void)
        !            48: {
        !            49:        long             pos;
        !            50:
        !            51:        if ((pos = ftell(ofp)) == -1)
        !            52:                err(1, "ftell");
        !            53:        if (pos >= INT32_MAX) {
        !            54:                errno = EOVERFLOW;
        !            55:                err(1, "ftell = %ld", pos);
        !            56:        }
        !            57:        return pos;
        !            58: }
        !            59:
        !            60: void
        !            61: dba_seek(int32_t pos)
        !            62: {
        !            63:        if (fseek(ofp, pos, SEEK_SET) == -1)
        !            64:                err(1, "fseek(%d)", pos);
        !            65: }
        !            66:
        !            67: int32_t
        !            68: dba_align(void)
        !            69: {
        !            70:        int32_t          pos;
        !            71:
        !            72:        pos = dba_tell();
        !            73:        while (pos & 3) {
        !            74:                dba_char_write('\0');
        !            75:                pos++;
        !            76:        }
        !            77:        return pos;
        !            78: }
        !            79:
        !            80: int32_t
        !            81: dba_skip(int32_t nmemb, int32_t sz)
        !            82: {
        !            83:        const int32_t    out[5] = {0, 0, 0, 0, 0};
        !            84:        int32_t          i, pos;
        !            85:
        !            86:        assert(sz >= 0);
        !            87:        assert(nmemb > 0);
        !            88:        assert(nmemb <= 5);
        !            89:        pos = dba_tell();
        !            90:        for (i = 0; i < sz; i++)
        !            91:                if (nmemb - fwrite(&out, sizeof(out[0]), nmemb, ofp))
        !            92:                        err(1, "fwrite");
        !            93:        return pos;
        !            94: }
        !            95:
        !            96: void
        !            97: dba_char_write(int c)
        !            98: {
        !            99:        if (putc(c, ofp) == EOF)
        !           100:                err(1, "fputc");
        !           101: }
        !           102:
        !           103: void
        !           104: dba_str_write(const char *str)
        !           105: {
        !           106:        if (fputs(str, ofp) == EOF)
        !           107:                err(1, "fputs");
        !           108:        dba_char_write('\0');
        !           109: }
        !           110:
        !           111: void
        !           112: dba_int_write(int32_t i)
        !           113: {
        !           114:        i = htobe32(i);
        !           115:        if (fwrite(&i, sizeof(i), 1, ofp) != 1)
        !           116:                err(1, "fwrite");
        !           117: }

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