project_files/frontlib/util/util.c
author sheepluva
Fri, 29 Apr 2016 13:12:26 +0200
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permissions -rw-r--r--
music credits etc.
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/*
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 * Hedgewars, a free turn based strategy game
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 * Copyright (C) 2012 Simeon Maxein <smaxein@googlemail.com>
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 *
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 * This program is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2
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 * of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
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 */
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#include "util.h"
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#include "logging.h"
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#include <stddef.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <limits.h>
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char *flib_asprintf(const char *fmt, ...) {
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    va_list argp;
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    va_start(argp, fmt);
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    char *result = flib_vasprintf(fmt, argp);
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    va_end(argp);
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    return result;
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}
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char *flib_vasprintf(const char *fmt, va_list args) {
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    char *result = NULL;
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    if(!log_badargs_if(fmt==NULL)) {
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        int requiredSize = vsnprintf(NULL, 0, fmt, args)+1;                 // Figure out how much memory we need,
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        if(!log_e_if(requiredSize<0, "Error formatting string with template \"%s\"", fmt)) {
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            char *tmpbuf = flib_malloc(requiredSize);                       // allocate it
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            if(tmpbuf && vsnprintf(tmpbuf, requiredSize, fmt, args)>=0) {   // and then do the actual formatting.
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                result = tmpbuf;
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                tmpbuf = NULL;
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            }
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            free(tmpbuf);
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        }
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    }
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    return result;
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}
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char *flib_join(char **parts, int partCount, const char *delimiter) {
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    char *result = NULL;
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    if(!log_badargs_if2(parts==NULL, delimiter==NULL)) {
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        size_t totalSize = 1;
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        size_t delimLen = strlen(delimiter);
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        for(int i=0; i<partCount; i++) {
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            totalSize += strlen(parts[i]) + delimLen;
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        }
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        result = flib_malloc(totalSize);
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        if(result) {
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            size_t outpos = 0;
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            for(int i=0; i<partCount; i++) {
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                if(i>0) {
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                    strcpy(result+outpos, delimiter);
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                    outpos += delimLen;
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                }
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                strcpy(result+outpos, parts[i]);
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                outpos += strlen(parts[i]);
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            }
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        }
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    }
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    return result;
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}
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char *flib_strdupnull(const char *str) {
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    return str==NULL ? NULL : flib_asprintf("%s", str);
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}
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void *flib_bufdupnull(const void *buf, size_t size) {
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    void *result = NULL;
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    if(!log_badargs_if(buf==NULL && size>0)) {
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        result = flib_malloc(size);
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        if(result) {
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            memcpy(result, buf, size);
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        }
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    }
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    return result;
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}
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void *flib_malloc(size_t size) {
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    void *result = malloc(size);
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    if(!result && size>0) {
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        flib_log_e("Out of memory trying to malloc %zu bytes.", size);
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    }
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    return result;
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}
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void *flib_calloc(size_t count, size_t elementsize) {
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    void *result = calloc(count, elementsize);
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    if(!result && count>0 && elementsize>0) {
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        flib_log_e("Out of memory trying to calloc %zu objects of %zu bytes each.", count, elementsize);
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    }
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    return result;
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}
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void *flib_realloc(void *ptr, size_t size) {
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    void *result = realloc(ptr, size);
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    if(!result && size>0) {
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        flib_log_e("Out of memory trying to realloc %zu bytes.", size);
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    }
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    return result;
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}
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static bool isAsciiAlnum(char c) {
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    return (c>='0' && c<='9') || (c>='a' && c <='z') || (c>='A' && c <='Z');
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}
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char *flib_urlencode(const char *inbuf) {
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    return flib_urlencode_pred(inbuf, isAsciiAlnum);
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}
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static size_t countCharsToEscape(const char *inbuf, bool (*needsEscaping)(char c)) {
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    size_t result = 0;
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    for(const char *c=inbuf; *c; c++) {
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        if(needsEscaping(*c)) {
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            result++;
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        }
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    }
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    return result;
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}
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char *flib_urlencode_pred(const char *inbuf, bool (*needsEscaping)(char c)) {
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    char *result = NULL;
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    if(inbuf && !log_badargs_if(needsEscaping == NULL)) {
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        size_t insize = strlen(inbuf);
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        if(!log_e_if(insize > SIZE_MAX/4, "String too long: %zu bytes.", insize)) {
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            size_t escapeCount = countCharsToEscape(inbuf, needsEscaping);
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            result = flib_malloc(insize + escapeCount*2 + 1);
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        }
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        if(result) {
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            char *out = result;
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            for(const char *in = inbuf; *in; in++) {
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                if(!needsEscaping(*in)) {
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                    *out = *in;
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                    out++;
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                } else {
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                    snprintf(out, 4, "%%%02x", (unsigned)(*(uint8_t*)in));
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                    out += 3;
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                }
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            }
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            *out = 0;
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        }
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    }
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    return result;
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}
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char *flib_urldecode(const char *inbuf) {
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    if(!inbuf) {
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        return NULL;
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    }
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    char *outbuf = flib_malloc(strlen(inbuf)+1);
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    if(!outbuf) {
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        return NULL;
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    }
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    size_t inpos = 0, outpos = 0;
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    while(inbuf[inpos]) {
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        if(inbuf[inpos] == '%' && isxdigit(inbuf[inpos+1]) && isxdigit(inbuf[inpos+2])) {
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            char temp[3] = {inbuf[inpos+1],inbuf[inpos+2],0};
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            outbuf[outpos++] = strtol(temp, NULL, 16);
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            inpos += 3;
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        } else {
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            outbuf[outpos++] = inbuf[inpos++];
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        }
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    }
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    outbuf[outpos] = 0;
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    char *shrunk = realloc(outbuf, outpos+1);
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    return shrunk ? shrunk : outbuf;
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}
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bool flib_contains_dir_separator(const char *str) {
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    if(!log_badargs_if(!str)) {
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        for(;*str;str++) {
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            if(*str=='\\' || *str=='/') {
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                return true;
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            }
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        }
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    }
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    return false;
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}
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bool flib_strempty(const char *str) {
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    return !str || !*str;
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}
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int flib_gets(char *str, size_t strlen) {
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    if(fgets(str, strlen, stdin)) {
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        for(char *s=str; *s; s++) {
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            if(*s=='\r' || *s=='\n') {
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                *s = 0;
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                break;
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            }
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        }
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        return 0;
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    }
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    return -1;
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}