diff -r b7d1317b138e -r fae240d633fc src/utils.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/utils.c	Tue Oct 17 16:15:41 2017 +0200
@@ -0,0 +1,260 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "ucx/utils.h"
+
+#include <math.h>
+#include <stdio.h>
+#include <limits.h>
+#include <errno.h>
+
+/* COPY FUCNTIONS */
+void* ucx_strcpy(const void* s, void* data) {
+    const char *str = (const char*) s;
+    size_t n = 1+strlen(str);
+    char *cpy = (char*) malloc(n);
+    memcpy(cpy, str, n);
+    return cpy;
+}
+
+void* ucx_memcpy(const void* m, void* n) {
+    size_t k = *((size_t*)n);
+    void *cpy = malloc(k);
+    memcpy(cpy, m, k);
+    return cpy;
+}
+
+size_t ucx_stream_bncopy(void *src, void *dest, read_func readfnc,
+        write_func writefnc, char* buf, size_t bufsize, size_t n) {
+    if(n == 0 || bufsize == 0) {
+        return 0;
+    }
+    
+    char *lbuf;    
+    size_t ncp = 0;
+    
+    if(buf) {
+        lbuf = buf;
+    } else {
+        lbuf = (char*)malloc(bufsize);
+        if(lbuf == NULL) {
+            return 0;
+        }
+    }
+    
+    size_t r;
+    size_t rn = bufsize > n ? n : bufsize;
+    while((r = readfnc(lbuf, 1, rn, src)) != 0) {
+        r = writefnc(lbuf, 1, r, dest);
+        ncp += r;
+        n -= r;
+        rn = bufsize > n ? n : bufsize;
+        if(r == 0 || n == 0) {
+            break;
+        }
+    }
+    
+    if (lbuf != buf) {
+        free(lbuf);
+    }
+    
+    return ncp;
+}
+
+/* COMPARE FUNCTIONS */
+
+int ucx_strcmp(const void *s1, const void *s2, void *data) {
+    return strcmp((const char*)s1, (const char*)s2);
+}
+
+int ucx_strncmp(const void *s1, const void *s2, void *n) {
+    return strncmp((const char*)s1, (const char*)s2, *((size_t*) n));
+}
+
+int ucx_intcmp(const void *i1, const void *i2, void *data) {
+   int a = *((const int*) i1);
+   int b = *((const int*) i2);
+   if (a == b) {
+       return 0;
+   } else {
+       return a < b ? -1 : 1;
+   }
+}
+
+int ucx_floatcmp(const void *f1, const void *f2, void *epsilon) {
+   float a = *((const float*) f1);
+   float b = *((const float*) f2);
+   float e = !epsilon ? 1e-6f : *((float*)epsilon);
+   if (fabsf(a - b) < e) {
+       return 0;
+   } else {
+       return a < b ? -1 : 1;
+   }
+}
+
+int ucx_doublecmp(const void *d1, const void *d2, void *epsilon) {
+   double a = *((const double*) d1);
+   double b = *((const double*) d2);
+   double e = !epsilon ? 1e-14 : *((double*)epsilon);
+   if (fabs(a - b) < e) {
+       return 0;
+   } else {
+       return a < b ? -1 : 1;
+   }
+}
+
+int ucx_ptrcmp(const void *ptr1, const void *ptr2, void *data) {
+    const intptr_t p1 = (const intptr_t) ptr1;
+    const intptr_t p2 = (const intptr_t) ptr2;
+    if (p1 == p2) {
+        return 0;
+    } else {
+        return p1  < p2 ? -1 : 1;
+    }
+}
+
+int ucx_memcmp(const void *ptr1, const void *ptr2, void *n) {
+    return memcmp(ptr1, ptr2, *((size_t*)n));
+}
+
+/* PRINTF FUNCTIONS */
+
+#ifdef va_copy
+#define UCX_PRINTF_BUFSIZE 256
+#else
+#pragma message("WARNING: C99 va_copy macro not supported by this platform" \
+                " - limiting ucx_*printf to 2 KiB")
+#define UCX_PRINTF_BUFSIZE 0x800
+#endif
+
+int ucx_fprintf(void *stream, write_func wfc, const char *fmt, ...) {
+    int ret;
+    va_list ap;
+    va_start(ap, fmt);
+    ret = ucx_vfprintf(stream, wfc, fmt, ap);
+    va_end(ap);
+    return ret;
+}
+
+int ucx_vfprintf(void *stream, write_func wfc, const char *fmt, va_list ap) {
+    char buf[UCX_PRINTF_BUFSIZE];
+#ifdef va_copy
+    va_list ap2;
+    va_copy(ap2, ap);
+    int ret = vsnprintf(buf, UCX_PRINTF_BUFSIZE, fmt, ap);
+    if (ret < 0) {
+        return ret;
+    } else if (ret < UCX_PRINTF_BUFSIZE) {
+        return (int)wfc(buf, 1, ret, stream);
+    } else {
+        if (ret == INT_MAX) {
+            errno = ENOMEM;
+            return -1;
+        }
+        
+        int len = ret + 1;
+        char *newbuf = (char*)malloc(len);
+        if (!newbuf) {
+            return -1;
+        }
+        
+        ret = vsnprintf(newbuf, len, fmt, ap2);
+        if (ret > 0) {
+            ret = (int)wfc(newbuf, 1, ret, stream);
+        }
+        free(newbuf);
+    }
+    return ret;
+#else
+    int ret = vsnprintf(buf, UCX_PRINTF_BUFSIZE, fmt, ap);
+    if (ret < 0) {
+        return ret;
+    } else if (ret < UCX_PRINTF_BUFSIZE) {
+        return (int)wfc(buf, 1, ret, stream);
+    } else {
+        errno = ENOMEM;
+        return -1;
+    }
+#endif
+}
+
+sstr_t ucx_asprintf(UcxAllocator *allocator, const char *fmt, ...) {
+    va_list ap;
+    sstr_t ret;
+    va_start(ap, fmt);
+    ret = ucx_vasprintf(allocator, fmt, ap);
+    va_end(ap);
+    return ret;
+}
+
+sstr_t ucx_vasprintf(UcxAllocator *a, const char *fmt, va_list ap) {
+    sstr_t s;
+    s.ptr = NULL;
+    s.length = 0;
+    char buf[UCX_PRINTF_BUFSIZE];
+#ifdef va_copy
+    va_list ap2;
+    va_copy(ap2, ap);
+    int ret = vsnprintf(buf, UCX_PRINTF_BUFSIZE, fmt, ap);
+    if (ret > 0 && ret < UCX_PRINTF_BUFSIZE) {
+        s.ptr = (char*)almalloc(a, ret + 1);
+        if (s.ptr) {
+            s.length = (size_t)ret;
+            memcpy(s.ptr, buf, ret);
+            s.ptr[s.length] = '\0';
+        }
+    } else if (ret == INT_MAX) {
+        errno = ENOMEM;
+    } else  {
+        int len = ret + 1;
+        s.ptr = (char*)almalloc(a, len);
+        if (s.ptr) {
+            ret = vsnprintf(s.ptr, len, fmt, ap2);
+            if (ret < 0) {
+                free(s.ptr);
+                s.ptr = NULL;
+            } else {
+                s.length = (size_t)ret;
+            }
+        }
+    }
+#else
+    int ret = vsnprintf(buf, UCX_PRINTF_BUFSIZE, fmt, ap);
+    if (ret > 0 && ret < UCX_PRINTF_BUFSIZE) {
+        s.ptr = (char*)almalloc(a, ret + 1);
+        if (s.ptr) {
+            s.length = (size_t)ret;
+            memcpy(s.ptr, buf, ret);
+            s.ptr[s.length] = '\0';
+        }
+    } else {
+        errno = ENOMEM;
+    }
+#endif
+    return s;
+}