485 lines
9.5 KiB
Plaintext
485 lines
9.5 KiB
Plaintext
/* $OpenBSD: parse.y,v 1.24 2021/10/15 15:01:27 naddy Exp $ */
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/*
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* Copyright (c) 2006 Bob Beck <beck@openbsd.org>
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* Copyright (c) 2002-2006 Henning Brauer <henning@openbsd.org>
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* Copyright (c) 2001 Markus Friedl. All rights reserved.
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* Copyright (c) 2001 Daniel Hartmeier. All rights reserved.
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* Copyright (c) 2001 Theo de Raadt. All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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%{
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/queue.h>
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#include <ctype.h>
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#include <err.h>
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#include <libgen.h>
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#include <limits.h>
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#include <paths.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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TAILQ_HEAD(files, file) files = TAILQ_HEAD_INITIALIZER(files);
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static struct file {
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TAILQ_ENTRY(file) entry;
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FILE *stream;
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char *name;
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int lineno;
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int errors;
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} *file, *topfile;
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struct file *pushfile(const char *);
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int popfile(void);
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int yyparse(void);
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int yylex(void);
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int yyerror(const char *, ...)
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__attribute__((__format__ (printf, 1, 2)))
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__attribute__((__nonnull__ (1)));
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int kw_cmp(const void *, const void *);
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int lookup(char *);
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int lgetc(int);
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int lungetc(int);
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int findeol(void);
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char *parse_tapedev(const char *, const char *, int);
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struct changer *new_changer(char *);
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struct changer {
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TAILQ_ENTRY(changer) entry;
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char *name;
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char **drives;
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u_int drivecnt;
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};
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TAILQ_HEAD(changers, changer) changers;
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struct changer *curchanger;
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typedef struct {
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union {
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int64_t number;
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char *string;
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} v;
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int lineno;
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} YYSTYPE;
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%}
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%token CHANGER
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%token DRIVE
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%token ERROR
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%token <v.string> STRING
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%token <v.number> NUMBER
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%%
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grammar : /* empty */
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| grammar '\n'
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| grammar main '\n'
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| grammar error '\n' { file->errors++; }
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;
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optnl : '\n' optnl
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;
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nl : '\n' optnl
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;
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main : CHANGER STRING optnl '{' optnl {
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curchanger = new_changer($2);
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}
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changeropts_l '}' {
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TAILQ_INSERT_TAIL(&changers, curchanger, entry);
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curchanger = NULL;
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}
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;
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changeropts_l : changeropts_l changeroptsl
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| changeroptsl
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;
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changeroptsl : changeropts nl
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| error nl
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;
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changeropts : DRIVE STRING {
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void *newp;
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if ((newp = reallocarray(curchanger->drives,
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curchanger->drivecnt + 1,
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sizeof(curchanger->drives))) == NULL)
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err(1, NULL);
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curchanger->drives = newp;
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if ((curchanger->drives[curchanger->drivecnt] =
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strdup($2)) == NULL)
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err(1, NULL);
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curchanger->drivecnt++;
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free($2);
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}
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;
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%%
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struct keywords {
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const char *k_name;
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int k_val;
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};
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int
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yyerror(const char *fmt, ...)
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{
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va_list ap;
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char *msg;
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file->errors++;
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va_start(ap, fmt);
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if (vasprintf(&msg, fmt, ap) == -1)
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err(1, "yyerror vasprintf");
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va_end(ap);
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err(1, "%s:%d: %s", file->name, yylval.lineno, msg);
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free(msg);
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return (0);
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}
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int
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kw_cmp(const void *k, const void *e)
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{
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return (strcmp(k, ((const struct keywords *)e)->k_name));
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}
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int
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lookup(char *s)
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{
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/* this has to be sorted always */
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static const struct keywords keywords[] = {
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{ "changer", CHANGER},
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{ "drive", DRIVE}
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};
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const struct keywords *p;
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p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
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sizeof(keywords[0]), kw_cmp);
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if (p)
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return (p->k_val);
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else
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return (STRING);
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}
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#define MAXPUSHBACK 128
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char *parsebuf;
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int parseindex;
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char pushback_buffer[MAXPUSHBACK];
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int pushback_index = 0;
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int
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lgetc(int quotec)
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{
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int c, next;
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if (parsebuf) {
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/* Read character from the parsebuffer instead of input. */
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if (parseindex >= 0) {
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c = (unsigned char)parsebuf[parseindex++];
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if (c != '\0')
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return (c);
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parsebuf = NULL;
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} else
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parseindex++;
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}
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if (pushback_index)
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return ((unsigned char)pushback_buffer[--pushback_index]);
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if (quotec) {
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if ((c = getc(file->stream)) == EOF) {
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yyerror("reached end of file while parsing "
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"quoted string");
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if (file == topfile || popfile() == EOF)
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return (EOF);
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return (quotec);
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}
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return (c);
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}
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while ((c = getc(file->stream)) == '\\') {
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next = getc(file->stream);
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if (next != '\n') {
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c = next;
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break;
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}
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yylval.lineno = file->lineno;
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file->lineno++;
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}
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while (c == EOF) {
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if (file == topfile || popfile() == EOF)
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return (EOF);
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c = getc(file->stream);
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}
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return (c);
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}
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int
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lungetc(int c)
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{
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if (c == EOF)
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return (EOF);
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if (parsebuf) {
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parseindex--;
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if (parseindex >= 0)
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return (c);
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}
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if (pushback_index + 1 >= MAXPUSHBACK)
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return (EOF);
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pushback_buffer[pushback_index++] = c;
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return (c);
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}
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int
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findeol(void)
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{
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int c;
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parsebuf = NULL;
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pushback_index = 0;
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/* skip to either EOF or the first real EOL */
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while (1) {
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c = lgetc(0);
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if (c == '\n') {
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file->lineno++;
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break;
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}
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if (c == EOF)
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break;
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}
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return (ERROR);
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}
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int
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yylex(void)
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{
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char buf[8096];
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char *p;
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int quotec, next, c;
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int token;
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p = buf;
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while ((c = lgetc(0)) == ' ' || c == '\t')
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; /* nothing */
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yylval.lineno = file->lineno;
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if (c == '#')
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while ((c = lgetc(0)) != '\n' && c != EOF)
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; /* nothing */
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switch (c) {
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case '\'':
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case '"':
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quotec = c;
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while (1) {
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if ((c = lgetc(quotec)) == EOF)
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return (0);
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if (c == '\n') {
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file->lineno++;
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continue;
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} else if (c == '\\') {
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if ((next = lgetc(quotec)) == EOF)
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return (0);
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if (next == quotec || c == ' ' || c == '\t')
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c = next;
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else if (next == '\n')
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continue;
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else
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lungetc(next);
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} else if (c == quotec) {
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*p = '\0';
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break;
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} else if (c == '\0') {
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yyerror("syntax error");
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return (findeol());
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}
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if (p + 1 >= buf + sizeof(buf) - 1) {
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yyerror("string too long");
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return (findeol());
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}
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*p++ = c;
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}
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yylval.v.string = strdup(buf);
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if (yylval.v.string == NULL)
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err(1, "%s", __func__);
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return (STRING);
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}
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#define allowed_to_end_number(x) \
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(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
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if (c == '-' || isdigit(c)) {
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do {
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*p++ = c;
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if ((size_t)(p-buf) >= sizeof(buf)) {
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yyerror("string too long");
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return (findeol());
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}
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} while ((c = lgetc(0)) != EOF && isdigit(c));
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lungetc(c);
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if (p == buf + 1 && buf[0] == '-')
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goto nodigits;
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if (c == EOF || allowed_to_end_number(c)) {
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const char *errstr = NULL;
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*p = '\0';
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yylval.v.number = strtonum(buf, LLONG_MIN,
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LLONG_MAX, &errstr);
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if (errstr) {
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yyerror("\"%s\" invalid number: %s",
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buf, errstr);
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return (findeol());
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}
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return (NUMBER);
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} else {
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nodigits:
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while (p > buf + 1)
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lungetc((unsigned char)*--p);
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c = (unsigned char)*--p;
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if (c == '-')
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return (c);
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}
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}
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#define allowed_in_string(x) \
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(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
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x != '{' && x != '}' && x != '<' && x != '>' && \
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x != '!' && x != '=' && x != '/' && x != '#' && \
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x != ','))
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if (isalnum(c) || c == ':' || c == '_' || c == '*') {
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do {
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*p++ = c;
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if ((size_t)(p-buf) >= sizeof(buf)) {
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yyerror("string too long");
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return (findeol());
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}
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} while ((c = lgetc(0)) != EOF && (allowed_in_string(c)));
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lungetc(c);
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*p = '\0';
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if ((token = lookup(buf)) == STRING)
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if ((yylval.v.string = strdup(buf)) == NULL)
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err(1, "%s", __func__);
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return (token);
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}
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if (c == '\n') {
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yylval.lineno = file->lineno;
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file->lineno++;
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}
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if (c == EOF)
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return (0);
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return (c);
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}
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struct file *
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pushfile(const char *name)
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{
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struct file *nfile;
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if ((nfile = calloc(1, sizeof(struct file))) == NULL)
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return (NULL);
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if ((nfile->name = strdup(name)) == NULL) {
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free(nfile);
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return (NULL);
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}
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if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
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free(nfile->name);
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free(nfile);
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return (NULL);
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}
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nfile->lineno = 1;
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TAILQ_INSERT_TAIL(&files, nfile, entry);
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return (nfile);
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}
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int
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popfile(void)
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{
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struct file *prev;
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if ((prev = TAILQ_PREV(file, files, entry)) != NULL)
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prev->errors += file->errors;
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TAILQ_REMOVE(&files, file, entry);
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fclose(file->stream);
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free(file->name);
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free(file);
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file = prev;
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return (file ? 0 : EOF);
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}
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char *
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parse_tapedev(const char *filename, const char *changer, int drive)
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{
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struct changer *p;
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char *tapedev = NULL;
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int errors = 0;
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TAILQ_INIT(&changers);
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if ((file = pushfile(filename)) == NULL) {
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warnx("cannot open the main config file!");
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goto guess;
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}
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topfile = file;
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yyparse();
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errors = file->errors;
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popfile();
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if (strncmp(changer, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0)
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changer += sizeof(_PATH_DEV) - 1;
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TAILQ_FOREACH(p, &changers, entry) {
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if (strcmp(changer, p->name) == 0) {
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if (drive >= 0 && drive < p->drivecnt) {
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if (asprintf(&tapedev, _PATH_DEV "%s",
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p->drives[drive]) == -1)
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errx(1, "malloc failed");
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} else
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tapedev = NULL;
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}
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}
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guess:
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/* if no device found, do the default of /dev/rstX */
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if (tapedev == NULL)
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if (asprintf(&tapedev, "/dev/rst%d", drive) == -1)
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errx(1, "malloc failed");
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return (tapedev);
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}
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struct changer *
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new_changer(char *name)
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{
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struct changer *p;
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if ((p = calloc(1, sizeof(*p))) == NULL)
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err(1, NULL);
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if ((p->name = strdup(name)) == NULL)
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err(1, NULL);
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return (p);
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}
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