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util: factor out reading file into preallocated buffer
Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy@virtuozzo.com>
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parent
600977e293
commit
3506ad7f0a
@ -1512,6 +1512,7 @@ virFileOpenTty;
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virFilePrintf;
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virFileReadAll;
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virFileReadAllQuiet;
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virFileReadBufQuiet;
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virFileReadHeaderFD;
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virFileReadLimFD;
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virFileRelLinkPointsTo;
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@ -1401,6 +1401,30 @@ virFileReadAllQuiet(const char *path, int maxlen, char **buf)
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return len;
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}
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/* Read @file into preallocated buffer @buf of size @len.
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* Return value is -errno in case of errors and size
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* of data read (no trailing zero) in case of success.
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* If there is more data then @len - 1 then data will be
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* truncated. */
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int
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virFileReadBufQuiet(const char *file, char *buf, int len)
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{
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int fd;
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ssize_t sz;
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fd = open(file, O_RDONLY);
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if (fd < 0)
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return -errno;
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sz = saferead(fd, buf, len - 1);
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VIR_FORCE_CLOSE(fd);
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if (sz < 0)
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return -errno;
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buf[sz] = '\0';
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return sz;
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}
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/* Truncate @path and write @str to it. If @mode is 0, ensure that
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@path exists; otherwise, use @mode if @path must be created.
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Return 0 for success, nonzero for failure.
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@ -131,6 +131,8 @@ int virFileReadAll(const char *path, int maxlen, char **buf)
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ATTRIBUTE_RETURN_CHECK ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(3);
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int virFileReadAllQuiet(const char *path, int maxlen, char **buf)
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ATTRIBUTE_RETURN_CHECK ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(3);
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int virFileReadBufQuiet(const char *file, char *buf, int len)
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ATTRIBUTE_RETURN_CHECK ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
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int virFileWriteStr(const char *path, const char *str, mode_t mode)
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ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
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@ -231,15 +231,8 @@ getDMISystemUUID(char *uuid, int len)
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};
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while (paths[i]) {
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int fd = open(paths[i], O_RDONLY);
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if (fd >= 0) {
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if (saferead(fd, uuid, len - 1) == len - 1) {
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uuid[len - 1] = '\0';
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VIR_FORCE_CLOSE(fd);
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if (virFileReadBufQuiet(paths[i], uuid, len) == len - 1)
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return 0;
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}
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VIR_FORCE_CLOSE(fd);
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}
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i++;
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}
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