구차니의 잡동사니 모음

static int
openredirect(union node *redir)
{
    char *fname;
    int f;

    switch (redir->nfile.type) {
    case NFROM:
        fname = redir->nfile.expfname;
        f = open(fname, O_RDONLY);
        if (f < 0)
            goto eopen;
        break;
    case NFROMTO:
        fname = redir->nfile.expfname;
        f = open(fname, O_RDWR|O_CREAT|O_TRUNC, 0666);
        if (f < 0)
            goto ecreate;
        break;
    case NTO:
        /* Take care of noclobber mode. */
        if (Cflag) {
            fname = redir->nfile.expfname;
            f = noclobberopen(fname);
            if (f < 0)
                goto ecreate;
            break;
        }
        /* FALLTHROUGH */
    case NCLOBBER:
        fname = redir->nfile.expfname;
        f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
        if (f < 0)
            goto ecreate;
        break;
    case NAPPEND:
        fname = redir->nfile.expfname;
        f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666);
        if (f < 0)
            goto ecreate;
        break;
    default:
#if DEBUG
        abort();
#endif
        /* Fall through to eliminate warning. */
    case NTOFD:
    case NFROMFD:
        f = -1;
        break;
    case NHERE:
    case NXHERE:
        f = openhere(redir);
        break;
    }

    return f;
 ecreate:
    ash_msg_and_raise_error("cannot create %s: %s", fname, errmsg(errno, "nonexistent directory"));
 eopen:
    ash_msg_and_raise_error("cannot open %s: %s", fname, errmsg(errno, "no such file"));
}

#include "stdio.h"
#include "string.h"
#include "iconv.h"
#include "errno.h"

#define BUFF_SIZE 64

int main()
{
        iconv_t cd = iconv_open("UNICODE", "UTF-8");
        if (cd == (iconv_t)(-1))
        {
                perror("iconv_open");
                return 0;
        }

        char inBuf[BUFF_SIZE] = "Hello world";
        int inBufSize = sizeof(inBuf);

        char outBuf[BUFF_SIZE];
        int outBufSize = sizeof(outBuf);
        memset(outBuf, 0, outBufSize);

        // convert
        size_t readBytes = strlen(inBuf);
        size_t writeBytes = sizeof(outBuf);
        char* in = inBuf;
        char* out = outBuf;

        printf("readBytes:%d writeBytes:%d\n",readBytes,writeBytes);

        if (iconv(cd, &in, &readBytes, &out, &writeBytes) == -1)
        {
                printf("failed to iconv errno:%d EILSEQ:%d\n", errno, EILSEQ);
        }
        else
        {
                int idx;
                printf("in:%x out:%x\n",in,out);
                printf("readBytes:%d writeBytes:%d\n",readBytes,writeBytes);
                for(idx = 0; idx < BUFF_SIZE; idx++)
                {
                        printf("%03d %c %x\t\t", idx, inBuf[idx], inBuf[idx]);
                        printf("%03d %c %x\n", idx, outBuf[idx], outBuf[idx]);
                }
                outBuf[writeBytes] = '\0';
        }

        iconv_close(cd);
        return 0;
}