source: cpp/common/util-string.cpp @ 875

// This file is a part of Framsticks SDK.  http://www.framsticks.com/
// Copyright (C) 1999-2019  Maciej Komosinski and Szymon Ulatowski.
// See LICENSE.txt for details.

#include "util-string.h"
#include <stdarg.h>
#include "nonstd_stdio.h"
#include "nonstd.h"
#include <assert.h>
#include <cstdlib> //malloc()
#ifdef USE_VIRTFILE
#include <common/virtfile/virtfile.h>
#endif

string ssprintf_va(const char* format, va_list ap)
{
        string s; //clang crashed when this declaration was in s=buf
        int size = 256;
        char* buf;
        va_list ap_copy; // "va_list ap" can only by used once by printf-type functions as they advance the current argument pointer (crashed on linux x86_64)
        // (does not apply to SString::sprintf, it does not have the va_list variant)

        //almost like SString::sprintf, but there is no common code to share because SString can use its directWrite to avoid double allocating/copying
#ifdef USE_VSCPRINTF
        va_copy(ap_copy, ap);
        size = _vscprintf(format, ap_copy) + 1; //+1 for terminating null character
        va_end(ap_copy);
#endif

        while (1)
        {
                buf = (char*)malloc(size);
                assert(buf != NULL);
                va_copy(ap_copy, ap);
                int n = vsnprintf(buf, size, format, ap_copy);
                va_end(ap_copy);
                if (n > -1 && n < size)
                {
                        s = buf;
                        free(buf);
                        return s;
                }
#ifdef VSNPRINTF_RETURNS_REQUIRED_SIZE
                if (n > -1)    /* glibc 2.1 */
                        size = n + 1; /* precisely what is needed */
                else           /* glibc 2.0 */
#endif
                        size *= 2;  /* twice the old size */
                free(buf);
        }
}

char* strmove(char *a, char *b) //strcpy that works well for overlapping strings ("Source and destination overlap")
{
        if (a == NULL || b == NULL)
                return NULL;
        memmove(a, b, strlen(b) + 1);
        return a;
}

string ssprintf(const char* format, ...)
{
        va_list ap;
        va_start(ap, format);
        string ret = ssprintf_va(format, ap); //is it too wasteful? copying the string again... unless the compiler can handle it better
        va_end(ap);
        return ret;
}

string stripExt(const string& filename)
{
        size_t dot = filename.rfind('.');
        if (dot == string::npos) return filename;
        size_t sep = filename.rfind(PATH_SEPARATOR_CHAR);
        if ((sep == string::npos) || (sep < dot))
                return filename.substr(0, dot);
        return filename;
}

string stripFileDir(const string& filename)
{
        size_t sep = filename.rfind(PATH_SEPARATOR_CHAR);
        if (sep == string::npos) return filename;
        return filename.substr(sep + 1);
}

string getFileExt(const string& filename)
{
        size_t dot = filename.rfind('.');
        if (dot == string::npos) return string("");
        size_t sep = filename.rfind(PATH_SEPARATOR_CHAR);
        if ((sep == string::npos) || (sep < dot))
                return filename.substr(dot);
        return string("");
}

string getFileDir(const string& filename)
{
        size_t slash = filename.rfind(PATH_SEPARATOR_CHAR);
        if (slash == string::npos) return string("");
        return filename.substr(0, slash);
}