38 lines
699 B
C
38 lines
699 B
C
/*
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* xreadlink.c - safe implementation of readlink.
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* Returns a NULL on failure...
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*/
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#include <stdio.h>
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/*
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* NOTE: This function returns a malloced char* that you will have to free
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* yourself. You have been warned.
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*/
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#include <unistd.h>
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#include "libbb.h"
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char *xreadlink(const char *path)
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{
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static const int GROWBY = 80; /* how large we will grow strings by */
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char *buf = NULL;
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int bufsize = 0, readsize = 0;
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do {
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buf = xrealloc(buf, bufsize += GROWBY);
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readsize = readlink(path, buf, bufsize); /* 1st try */
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if (readsize == -1) {
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bb_perror_msg("%s", path);
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free(buf);
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return NULL;
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}
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}
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while (bufsize < readsize + 1);
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buf[readsize] = '\0';
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return buf;
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}
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