Blame src/general/sscanf_long.c

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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include <errno.h>
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#include <sys/resource.h>
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#include "test.h"
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static void setrl(int r, long lim)
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{
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	struct rlimit rl;
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	if (getrlimit(r, &rl))
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		error("getrlimit %d: %s\n", r, strerror(errno));
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	rl.rlim_cur = lim;
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	if (setrlimit(r, &rl))
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		error("setrlimit %d: %s\n", r, strerror(errno));
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}
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int main(void)
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{
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	enum {n = 8*1024*1024};
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	char *s = malloc(n);
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	int i;
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	float f;
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	char c;
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	if (!s)
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		return error("out of memory");
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	setrl(RLIMIT_STACK, 128*1024);
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	for (i = 0; i < n; i++) s[i] = '1';
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	s[n-3] = ' ';
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	s[n-1] = 0;
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	/*
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	 * stack overflow if scanf copies s on the stack (glibc)
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	 * same issue with %d except then storing the conversion
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	 * result is undefined behaviour
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	 */
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	i = sscanf(s, "%f %c", &f, &c);
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	if (i != 2)
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		error("sscanf returned %d, want 2\n", i);
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	if (f != INFINITY)
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		error("sscanf(longnum, \"%%f\") read %f, want inf\n", f);
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	if (c != '1')
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		error("sscanf(\"1\", %%c) read '%c', want '1'\n", c);
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	free(s);
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	return test_status;
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}