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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;
}