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Annotation of embedaddon/confuse/src/fmemopen.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Copyright (c) 2017  Joachim Nilsson <troglobit@gmail.com>
        !             3:  *
        !             4:  * Permission to use, copy, modify, and/or distribute this software for any
        !             5:  * purpose with or without fee is hereby granted, provided that the above
        !             6:  * copyright notice and this permission notice appear in all copies.
        !             7:  *
        !             8:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
        !             9:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
        !            10:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
        !            11:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
        !            12:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
        !            13:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
        !            14:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
        !            15:  */
        !            16: 
        !            17: #ifdef HAVE_CONFIG_H
        !            18: # include <config.h>
        !            19: #endif
        !            20: 
        !            21: #include <stdio.h>
        !            22: 
        !            23: #ifdef HAVE_FUNOPEN
        !            24: #include <stdlib.h>
        !            25: #include <memory.h>
        !            26: 
        !            27: struct ops {
        !            28:        char   *buf;
        !            29:        size_t  len, pos;
        !            30: };
        !            31: 
        !            32: typedef struct ops ops_t;
        !            33: 
        !            34: static int readfn(void *arg, char *buf, int len)
        !            35: {
        !            36:        int sz;
        !            37:        ops_t *ops = (ops_t *)arg;
        !            38: 
        !            39:        sz = (int)(ops->len - ops->pos);
        !            40:        if (sz < 0)
        !            41:                sz = 0;
        !            42:        if (len > sz)
        !            43:                len = sz;
        !            44: 
        !            45:        memcpy(buf, &ops->buf[ops->pos], len);
        !            46:        ops->pos += len;
        !            47: 
        !            48:        return len;
        !            49: }
        !            50: 
        !            51: static int writefn(void *arg, const char *buf, int len)
        !            52: {
        !            53:        int sz;
        !            54:        ops_t *ops = (ops_t *)arg;
        !            55: 
        !            56:        sz = (int)(ops->len - ops->pos);
        !            57:        if (sz < 0)
        !            58:                sz = 0;
        !            59:        if (len > sz)
        !            60:                len = sz;
        !            61: 
        !            62:        memcpy(&ops->buf[ops->pos], buf, len);
        !            63:        ops->pos += len;
        !            64: 
        !            65:        return len;
        !            66: }
        !            67: 
        !            68: static fpos_t seekfn(void *arg, fpos_t offset, int whence)
        !            69: {
        !            70:        fpos_t pos;
        !            71:        ops_t *ops = (ops_t *)arg;
        !            72: 
        !            73:        switch (whence) {
        !            74:        case SEEK_SET:
        !            75:                pos = offset;
        !            76:                break;
        !            77: 
        !            78:        case SEEK_END:
        !            79:                pos = ops->len + offset;
        !            80:                break;
        !            81: 
        !            82:        case SEEK_CUR:
        !            83:                pos = ops->pos + offset;
        !            84:                break;
        !            85: 
        !            86:        default:
        !            87:                return -1;
        !            88:        }
        !            89: 
        !            90:        if (pos < 0 || (size_t)pos > ops->len) {
        !            91:                ops->pos = 0;
        !            92:                return -1;
        !            93:        }
        !            94: 
        !            95:        return 0;
        !            96: }
        !            97: 
        !            98: static int closefn(void *arg)
        !            99: {
        !           100:        free(arg);
        !           101:        return 0;
        !           102: }
        !           103: 
        !           104: FILE *fmemopen(void *buf, size_t len, const char *type)
        !           105: {
        !           106:        ops_t *ops = malloc(sizeof(*ops));
        !           107: 
        !           108:        if (!ops)
        !           109:                return NULL;
        !           110: 
        !           111:        memset(ops, 0, sizeof(*ops));
        !           112:        ops->buf = buf;
        !           113:        ops->len = len;
        !           114:        ops->pos = 0;
        !           115: 
        !           116:        return funopen(ops, readfn, writefn, seekfn, closefn);
        !           117: }
        !           118: #elif defined(HAVE_WINDOWS_H)
        !           119: #include <io.h>
        !           120: #include <fcntl.h>
        !           121: #include <sys/stat.h>
        !           122: #include <windows.h>
        !           123: 
        !           124: FILE *fmemopen(void *buf, size_t len, const char *type)
        !           125: {
        !           126:        int fd;
        !           127:        FILE *fp;
        !           128:        char tp[MAX_PATH - 13];
        !           129:        char fn[MAX_PATH + 1];
        !           130: 
        !           131:        if (!GetTempPathA(sizeof(tp), tp))
        !           132:                return NULL;
        !           133: 
        !           134:        if (!GetTempFileNameA(tp, "confuse", 0, fn))
        !           135:                return NULL;
        !           136: 
        !           137:        fd = _open(fn,
        !           138:                _O_CREAT | _O_RDWR | _O_SHORT_LIVED | _O_TEMPORARY | _O_BINARY,
        !           139:                _S_IREAD | _S_IWRITE);
        !           140:        if (fd == -1)
        !           141:                return NULL;
        !           142: 
        !           143:        fp = _fdopen(fd, "w+");
        !           144:        if (!fp) {
        !           145:                _close(fd);
        !           146:                return NULL;
        !           147:        }
        !           148: 
        !           149:        fwrite(buf, len, 1, fp);
        !           150:        rewind(fp);
        !           151: 
        !           152:        return fp;
        !           153: }
        !           154: 
        !           155: #else
        !           156: #error Sorry, this platform currently has no fmemopen() replacement.
        !           157: #endif
        !           158: 
        !           159: /**
        !           160:  * Local Variables:
        !           161:  *  indent-tabs-mode: t
        !           162:  *  c-file-style: "linux"
        !           163:  * End:
        !           164:  */