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usr/lib/libcervus/math/abs.c

@@ -0,0 +1,5 @@
+#include <math.h>
+
+int abs(int n) {
+    return n >= 0 ? n : -n;
+}

usr/lib/libcervus/math/fabs.c

@@ -0,0 +1,12 @@
+#include <math.h>
+#include <stdint.h>
+
+double fabs(double x) {
+    union {
+        double d;
+        uint64_t i;
+    } u = { .d = x };
+    
+    u.i &= 0x7FFFFFFFFFFFFFFFULL;
+    return u.d;
+}

usr/lib/libcervus/math/isinf.c

@@ -0,0 +1,14 @@
+#include <math.h>
+#include <stdint.h>
+
+int isinf(double x) {
+    union {
+        double f;
+        uint64_t i;
+    } u = { .f = x };
+
+    uint64_t exp = (u.i >> 52) & 0x7FF;
+    uint64_t mantissa = u.i & 0xFFFFFFFFFFFFFULL;
+
+    return (exp == 0x7FF) && (mantissa == 0);
+}

usr/lib/libcervus/math/isnan.c

@@ -0,0 +1,14 @@
+#include <math.h>
+#include <stdint.h>
+
+int isnan(double x) {
+    union {
+        double f;
+        uint64_t i;
+    } u = { .f = x };
+
+    uint64_t exp = (u.i >> 52) & 0x7FF;
+    uint64_t mantissa = u.i & 0xFFFFFFFFFFFFFULL;
+
+    return (exp == 0x7FF) && (mantissa != 0);
+}

usr/lib/libcervus/math/pow.c

@@ -0,0 +1,37 @@
+#include <math.h>
+
+double pow(double x, double y) {
+    if (y == 0.0) return 1.0;
+    
+    if (y == (int)y) {
+        int n = (int)y;
+        double result = 1.0;
+        
+        if (n > 0) {
+            for (int i = 0; i < n; i++) {
+                result *= x;
+            }
+        } else {
+            for (int i = 0; i < -n; i++) {
+                result /= x;
+            }
+        }
+        
+        return result;
+    }
+    
+    if (x > 0.0) {
+        int int_part = (int)y;
+        double frac_part = y - int_part;
+        
+        double int_pow = pow(x, int_part);
+        
+        if (frac_part > 0.0) {
+            return int_pow * (1.0 + frac_part * (x - 1.0));
+        } else {
+            return int_pow / (1.0 - frac_part * (x - 1.0));
+        }
+    }
+    
+    return NAN;
+}

usr/lib/libcervus/math/pow10.c

@@ -0,0 +1,17 @@
+#include <math.h>
+
+double pow10(int n) {
+    double result = 1.0;
+    
+    if (n >= 0) {
+        for (int i = 0; i < n; i++) {
+            result *= 10.0;
+        }
+    } else {
+        for (int i = 0; i < -n; i++) {
+            result /= 10.0;
+        }
+    }
+    
+    return result;
+}