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 /*

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

  *

  * Copyright 2017 Mike Becker, 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;

 }