copy.cc

来自「一个mips虚拟机非常好代码,使用C++来编写的,希望大家多学学,」· CC 代码 · 共 54 行

#include <stdarg.h>
#include <string.h>
#include "error.hh"
#include "sulima.hh"


// Create a dynamically-allocated copy of the string (s), sort of like BSD
// strdup().

char *
copy(const char *s)
{
    size_t len = strlen(s) + 1;
    char *ret = new char[len];
    memcpy(ret, s, len);
    return ret;
}


// A bloated but useful version of the above. Returned a dynamically-
// allocated copy of the arguments, concatenated into a single string. The
// list of arguments is null-terminated.  This function is not particularly
// fast, but then again, it does not have to be in order to be useful.

char *
copy(const char *s0, const char *s1, ...)
{
    va_list ap;
    size_t len0 = strlen(s0), len = 0;
    const char *s;

    // Compute the total length of the strings.
    va_start(ap, s1);
    for (s = s1, len = len0; s; s = va_arg(ap, const char *))
	len += strlen(s);
    va_end(ap);

    // Allocate the memory and return concatenated result.
    char *ret = new char[len + 1];
    memcpy(ret, s0, len0);
    char *d = ret + len0;
    va_start(ap, s1);
    for (s = s1; s; s = va_arg(ap, const char *)) {
	len = strlen(s);
	memcpy(d, s, len);
	d += len;
    }
    va_end(ap);
    *d = '\0';

    return ret;

}