mirror of
https://github.com/encounter/newlib.git
synced 2026-03-30 11:31:09 -07:00
Dave Murphy
55 lines
1.0 KiB
C
55 lines
1.0 KiB
C
#include "config.h"
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#include <_ansi.h>
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#include <_syslist.h>
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#include <stdio.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/iosupport.h>
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int truncate(const char *file, off_t len)
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{
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__handle *handle;
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int dev, fd, ret;
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struct _reent * r = _REENT;
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dev = FindDevice(file);
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if(dev!=-1 && devoptab_list[dev]->open_r && devoptab_list[dev]->close_r &&
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devoptab_list[dev]->ftruncate_r)
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{
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fd = __alloc_handle(dev);
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if ( -1 != fd ) {
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handle = __get_handle(fd);
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r->deviceData = devoptab_list[dev]->deviceData;
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ret = devoptab_list[dev]->open_r(r, handle->fileStruct, file, O_WRONLY, 0);
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if ( ret < 0 ) {
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__release_handle(fd);
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return ret;
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}
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ret = devoptab_list[dev]->ftruncate_r(r, handle->fileStruct, len);
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if (ret >= 0) {
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ret = devoptab_list[dev]->close_r(r, handle->fileStruct);
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} else {
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// Close it anyway, we don't want to leak memory
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devoptab_list[dev]->close_r(r, handle->fileStruct);
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}
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} else {
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r->_errno = ENOSR;
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}
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} else {
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r->_errno = ENOSYS;
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}
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return ret;
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}
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