ThrowingAssert.cc File Reference

Some implementation for assert. More...

#include "common_priv.h"
#include <cpn/utils/ThrowingAssert.h>
#include <cpn/utils/StackTrace.h>
#include <sstream>
#include <vector>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>

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Functions
std::string	CreateMessage (const char *exp, const char *file, int line, const char *func, const char *msg)
bool	__ASSERT (const char *exp, const char *file, int line, const char *func, bool die)
bool	__ASSERT (const char *exp, const char *file, int line, const char *func, bool die, const std::string &msg)
bool	__ASSERT (const char *exp, const char *file, int line, const char *func, bool die, const char *fmt,...)

Detailed Description

Some implementation for assert.

Author

John Bridgman

Definition in file ThrowingAssert.cc.

Function Documentation

bool __ASSERT	(	const char *	exp,
		const char *	file,
		int	line,
		const char *	func,
		bool	die
	)

Definition at line 59 of file ThrowingAssert.cc.

References CreateMessage(), and GetStack().

                                                                                       {
    if (die) {
        fprintf(stderr, "%s\nBacktrace:\n%s\n",
                CreateMessage(exp, file, line, func, "").c_str(), GetStack(2).c_str());
        abort();
    } else {
        throw AssertException(CreateMessage(exp, file, line, func, ""));
    }
}

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bool __ASSERT	(	const char *	exp,
		const char *	file,
		int	line,
		const char *	func,
		bool	die,
		const std::string &	msg
	)

Definition at line 69 of file ThrowingAssert.cc.

References CreateMessage(), and GetStack().

                                                                                                             {
    if (die) {
        fprintf(stderr, "%s\nBacktrace:\n%s\n",
                CreateMessage(exp, file, line, func, "").c_str(), GetStack(2).c_str());
        abort();
    } else {
        throw AssertException(CreateMessage(exp, file, line, func, msg.c_str()));
    }
}

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bool __ASSERT	(	const char *	exp,
		const char *	file,
		int	line,
		const char *	func,
		bool	die,
		const char *	fmt,
			...
	)

Definition at line 79 of file ThrowingAssert.cc.

References CreateMessage(), and GetStack().

                                                                                                             {
    std::vector<char> buff(128, '\0');
    // Note this is based on the exmaple in the man page for vsnprintf.
    while (1) {
        /* Try to print in the allocated space. */
        va_list ap;
        va_start(ap, fmt);
        int n = vsnprintf(&buff[0], buff.size(), fmt, ap);
        va_end(ap);
        /* If that worked, return the string. */
        if (n > -1 && unsigned(n) < buff.size()) {
            break;
        }
        /* Else try again with more space. */
        if (n > -1) { /* glibc 2.1 */ /* precisely what is needed */
            buff.resize(n+1, '\0');
        }
        else { /* glibc 2.0 */ /* twice the old size */
            buff.resize(buff.size()*2, '\0');
        }
    }
    std::string msg = CreateMessage(exp, file, line, func, &buff[0]);
    if (die) {
        fprintf(stderr, "%s\nBacktrace:\n%s\n", msg.c_str(), GetStack(2).c_str());
        abort();
    } else {
        throw AssertException(msg);
    }
}

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std::string CreateMessage	(	const char *	exp,
		const char *	file,
		int	line,
		const char *	func,
		const char *	msg
	)

Definition at line 34 of file ThrowingAssert.cc.

Referenced by __ASSERT().

                                                     {
    std::ostringstream oss;
    oss << "Assert failed in " << file << ":" << line;
    oss << " in " << func;
    oss << " : " << exp << '\n' << msg << '\n';
    return oss.str();
}

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