1 /*- 2 * Copyright (c) 1992 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Rodney Ruddock of the University of Guelph. 7 * 8 * %sccs.include.redist.c% 9 */ 10 11 #ifndef lint 12 static char sccsid[] = "@(#)filename.c 5.4 (Berkeley) 02/28/93"; 13 #endif /* not lint */ 14 15 #include <sys/types.h> 16 17 #include <limits.h> 18 #include <regex.h> 19 #include <setjmp.h> 20 #include <stdio.h> 21 #include <stdlib.h> 22 #include <string.h> 23 24 #ifdef DBI 25 #include <db.h> 26 #endif 27 28 #include "ed.h" 29 #include "extern.h" 30 31 32 /* 33 * A central function for any command that has to deal with a filename 34 * (to be or not to be remembered). 35 */ 36 char * 37 filename(inputt, errnum) 38 FILE *inputt; 39 int *errnum; 40 { 41 register int l_cnt = 0; 42 char *l_fname; 43 int l_esc = 0, l_bang_flag = 0, l_len; 44 45 l_fname = calloc(FILENAME_LEN, sizeof(char)); 46 if (l_fname == NULL) { 47 *errnum = -1; 48 strcpy(help_msg, "out of memory error"); 49 return (NULL); 50 } 51 if ((ss = getc(inputt)) != ' ') { 52 if (ss == '\n') { 53 ungetc(ss, inputt); 54 /* 55 * It's not really an error, but to flag remembered 56 * filename is to be used. 57 */ 58 *errnum = -2; 59 } else { 60 *errnum = -1; 61 strcpy(help_msg, 62 "space required before filename given"); 63 } 64 return (NULL); 65 } 66 while (ss = getc(inputt)) 67 if (ss != ' ') { 68 ungetc(ss, inputt); 69 break; 70 } 71 for (;;) { 72 ss = getc(inputt); 73 if ((ss == '\\') && (l_esc == 0)) { 74 ss = getchar(); 75 l_esc = 1; 76 } else 77 l_esc = 0; 78 if ((ss == '\n') || (ss == EOF)) { 79 l_fname[l_cnt] = '\0'; 80 break; 81 } else 82 if ((ss == '!') && (l_esc == 0)) 83 l_bang_flag = 1; 84 else 85 if ((ss != ' ') || (l_bang_flag)) 86 l_fname[l_cnt++] = ss; 87 else { 88 *errnum = -1; 89 return (NULL); 90 } 91 92 if (l_cnt >= FILENAME_LEN) { 93 strcpy(help_msg, "filename+path length too long"); 94 *errnum = -1; 95 ungetc('\n', inputt); 96 return (NULL); 97 } 98 } 99 100 if (l_bang_flag == 1) { /* user wants the name from a sh command */ 101 FILE *namestream, *popen(); 102 103 if (l_fname[0] == '\0') { 104 strcpy(help_msg, "no command given"); 105 *errnum = -1; 106 return (NULL); 107 } 108 if (((namestream = popen(l_fname, "r")) == NULL) || 109 ((fgets(l_fname, FILENAME_LEN - 1, namestream)) == NULL)) { 110 strcpy(help_msg, "error executing command"); 111 *errnum = -1; 112 if (namestream != NULL) 113 pclose(namestream); 114 ungetc('\n', inputt); 115 return (NULL); 116 } 117 l_len = strlen(l_fname) - 1; 118 if (l_fname[l_len] == '\n') 119 l_fname[l_len] = '\0'; 120 pclose(namestream); 121 } else 122 if (l_fname[0] == '\0') { 123 sigspecial++; 124 strcpy(l_fname, filename_current); 125 sigspecial--; 126 if (sigint_flag && (!sigspecial)) 127 SIGINT_ACTION; 128 } 129 *errnum = 1; 130 return (l_fname); 131 } 132