1 /* 2 * Copyright (c) 1983 Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Edward Wang at The University of California, Berkeley. 7 * 8 * %sccs.include.redist.c% 9 */ 10 11 #ifndef lint 12 static char sccsid[] = "@(#)context.c 3.13 (Berkeley) 08/24/92"; 13 #endif /* not lint */ 14 15 #include "value.h" 16 #include "string.h" 17 #include "context.h" 18 #include <fcntl.h> 19 20 /* 21 * Context push/pop for nested command files. 22 */ 23 24 char *malloc(); 25 26 cx_alloc() 27 { 28 register struct context *xp; 29 30 if (cx.x_type != 0) { 31 xp = (struct context *) 32 malloc((unsigned) sizeof (struct context)); 33 if (xp == 0) 34 return -1; 35 *xp = cx; 36 cx.x_link = xp; 37 cx.x_type = 0; 38 } 39 cx.x_erred = 0; 40 cx.x_synerred = 0; 41 cx.x_abort = 0; 42 return 0; 43 } 44 45 cx_free() 46 { 47 struct context *xp; 48 49 if ((xp = cx.x_link) != 0) { 50 cx = *xp; 51 free((char *)xp); 52 } else 53 cx.x_type = 0; 54 } 55 56 cx_beginfile(filename) 57 char *filename; 58 { 59 if (cx_alloc() < 0) 60 return -1; 61 cx.x_type = X_FILE; 62 if ((cx.x_filename = str_cpy(filename)) == 0) 63 goto bad; 64 cx.x_fp = fopen(filename, "r"); 65 if (cx.x_fp == 0) 66 goto bad; 67 (void) fcntl(fileno(cx.x_fp), F_SETFD, 1); 68 cx.x_bol = 1; 69 cx.x_lineno = 0; 70 cx.x_errwin = 0; 71 cx.x_noerr = 0; 72 return 0; 73 bad: 74 if (cx.x_filename != 0) 75 str_free(cx.x_filename); 76 cx_free(); 77 return -1; 78 } 79 80 cx_beginbuf(buf, arg, narg) 81 char *buf; 82 struct value *arg; 83 int narg; 84 { 85 if (cx_alloc() < 0) 86 return -1; 87 cx.x_type = X_BUF; 88 cx.x_bufp = cx.x_buf = buf; 89 cx.x_arg = arg; 90 cx.x_narg = narg; 91 return 0; 92 } 93 94 cx_end() 95 { 96 switch (cx.x_type) { 97 case X_BUF: 98 break; 99 case X_FILE: 100 (void) fclose(cx.x_fp); 101 str_free(cx.x_filename); 102 break; 103 } 104 cx_free(); 105 } 106