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Annotation of 42BSD/usr.lib/libU77/perror_.c, revision 1.1

1.1     ! root        1: /*
        !             2: char id_perror[] = "@(#)perror_.c      1.2";
        !             3:  *
        !             4:  * write a standard error message to the standard error output
        !             5:  *
        !             6:  * calling sequence:
        !             7:  *     call perror(string)
        !             8:  * where:
        !             9:  *     string will be written preceeding the standard error message
        !            10:  */
        !            11: 
        !            12: #include       <stdio.h>
        !            13: #include       "../libI77/fiodefs.h"
        !            14: #include       "../libI77/f_errno.h"
        !            15: 
        !            16: extern char *sys_errlist[];
        !            17: extern int sys_nerr;
        !            18: extern char *f_errlist[];
        !            19: extern int f_nerr;
        !            20: extern unit units[];
        !            21: 
        !            22: perror_(s, len)
        !            23: char *s; long len;
        !            24: {
        !            25:        unit    *lu;
        !            26:        char    buf[40];
        !            27:        char    *mesg = s + len;
        !            28: 
        !            29:        while (len > 0 && *--mesg == ' ')
        !            30:                len--;
        !            31:        if (errno >=0 && errno < sys_nerr)
        !            32:                mesg = sys_errlist[errno];
        !            33:        else if (errno >= F_ER && errno < (F_ER + f_nerr))
        !            34:                mesg = f_errlist[errno - F_ER];
        !            35:        else
        !            36:        {
        !            37:                sprintf(buf, "%d: unknown error number", errno);
        !            38:                mesg = buf;
        !            39:        }
        !            40:        lu = &units[STDERR];
        !            41:        if (!lu->uwrt)
        !            42:                nowwriting(lu);
        !            43:        while (len-- > 0)
        !            44:                putc(*s++, lu->ufd);
        !            45:        fprintf(lu->ufd, ": %s\n", mesg);
        !            46: }

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