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#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <sys/time.h>
#define START gettimeofday(&tv1, 0);
#define END(x) gettimeofday(&tv2, 0); t1 = ((double)tv1.tv_sec)+((double)tv1.tv_usec)/1000000.0; t2 = ((double)tv2.tv_sec)+((double)tv2.tv_usec)/1000000.0; printf("%s: %f seconds\n", x, t2-t1)
int main(int argc __unused, char **argv __unused) {
struct timeval tv1, tv2;
double t1, t2;
char * const s = (char * const) malloc(16);
char * const l = (char * const) malloc(15001);
char * const tmp = (char * const) malloc(15001);
for(int i=0; i<15; i++)
s[i]='a';
s[15]=0;
START;
for(int i=0; i<10000000; i++) {
memset(l, 'a', 15000);
}
END("10000000 * memset 15000*'a'");
l[15000]=0;
START;
for(int i=0; i<500000000; i++)
if(strlen(s) != 15)
fprintf(stderr, "strlen broken\n");
END("500000000 * strlen(15*a)");
START;
for(int i=0; i<1000000; i++)
if(strlen(l) != 15000)
fprintf(stderr, "strlen broken\n");
END("1000000 * strlen(15000*a)");
START;
for(int i=0; i<10000000; i++)
if(memchr(l, 'b', 15000))
fprintf(stderr, "bogus memchr\n");
END("10000000 * memchr not finding anything in 15000 chars");
START;
for(int i=0; i<10000000; i++)
if(strchr(l, 'b'))
fprintf(stderr, "bogus strchr\n");
END("10000000 * strchr not finding anything in 15000 chars");
l[5000]='b';
START;
for(int i=0; i<10000000; i++) {
char *b=memchr(l, 'b', 15000);
if(!b || *b != 'b')
fprintf(stderr, "bogus memchr II\n");
}
END("10000000 * memchr finding match at 5000");
START;
for(int i=0; i<10000000; i++) {
char *b=strchr(l, 'b');
if(!b || *b != 'b')
fprintf(stderr, "bogus strchr II\n");
}
END("10000000 * strchr finding match at 5000");
START;
for(int i=0; i<10000000; i++) {
memcpy(tmp, l, 15000);
}
END("10000000 * memcpy of 15000 bytes");
START;
for(int i=0; i<900000000; i++) {
memcpy(tmp, s, 15);
}
END("900000000 * memcpy of 15 bytes");
START;
for(int i=0; i<1000000; i++) {
strcpy(tmp, l);
}
END("1000000 * strcpy of 15000 bytes");
START;
for(int i=0; i<100000000; i++) {
strcpy(tmp, s);
}
END("100000000 * strcpy of 15 bytes");
START;
for(int i=0; i<15000; i++) {
memset(tmp, 0, 15000);
for(int j=0; j<15000; j++) {
strcat(tmp, "a");
}
}
END("15000 * 15000 * strcat + 1 byte");
memset(l, 0, 15000);
memset(l, 'a', 1000);
START;
for(int i=0; i<15000; i++) {
memset(tmp, 0, 15000);
for(int j=0; j<15; j++) {
strcat(tmp, l);
}
}
END("15000 * 15 * strcat + 1000 bytes");
return 0;
}
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