1 /*
2 * $Id: argv.c,v 1.12 2018/06/12 22:47:23 tom Exp $
3 *
4 * argv - Reusable functions for argv-parsing.
5 *
6 * Copyright 2011-2017,2018 Thomas E. Dickey
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU Lesser General Public License, version 2.1
10 * as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this program; if not, write to
19 * Free Software Foundation, Inc.
20 * 51 Franklin St., Fifth Floor
21 * Boston, MA 02110, USA.
22 */
23
24 #include <dialog.h>
25 #include <string.h>
26
27 /*
28 * Convert a string to an argv[], returning a char** index (which must be
29 * freed by the caller). The string is modified (replacing gaps between
30 * tokens with nulls).
31 */
32 char **
dlg_string_to_argv(char * blob)33 dlg_string_to_argv(char *blob)
34 {
35 size_t n, k;
36 int pass;
37 size_t length = strlen(blob);
38 char **result = 0;
39
40 #ifdef HAVE_DLG_TRACE
41 if (dialog_state.trace_output) {
42 DLG_TRACE(("# dlg_string_to_argv:\n"));
43 DLG_TRACE(("# given:\n"));
44 for (n = k = 0; n < length; ++n) {
45 if (blob[n] == '\n') {
46 DLG_TRACE(("#%s\t%.*s\\n\n",
47 k ? "+" : "",
48 (int) (n - k), blob + k));
49 k = n + 1;
50 }
51 }
52 if (n > k) {
53 DLG_TRACE(("#%s\t%.*s\n",
54 k ? "+" : "",
55 (int) (n - k), blob + k));
56 }
57 DLG_TRACE(("# result:\n"));
58 }
59 #endif
60 for (pass = 0; pass < 2; ++pass) {
61 bool inparm = FALSE;
62 bool quoted = FALSE;
63 bool escape = FALSE;
64 char *param = blob;
65 size_t count = 0;
66
67 for (n = 0; n < length; ++n) {
68 if (escape) {
69 ;
70 } else if (quoted && blob[n] == '"') {
71 quoted = FALSE;
72 } else if (blob[n] == '"') {
73 quoted = TRUE;
74 if (!inparm) {
75 if (pass)
76 result[count] = param;
77 ++count;
78 inparm = TRUE;
79 }
80 } else if (!quoted && isspace(UCH(blob[n]))) {
81 if (inparm) {
82 if (pass) {
83 *param++ = '\0';
84 }
85 inparm = FALSE;
86 }
87 } else {
88 if (blob[n] == '\\') {
89 if (n + 1 == length) {
90 break; /* The string is terminated by a backslash */
91 } else if ((blob[n + 1] == '\\') ||
92 (blob[n + 1] == '"') ||
93 (!quoted && blob[n + 1] == '\n')) {
94 /* eat the backslash */
95 if (pass) {
96 --length;
97 for (k = n; k < length; ++k)
98 blob[k] = blob[k + 1];
99 blob[length] = '\0';
100 } else {
101 escape = TRUE;
102 continue;
103 }
104 }
105 }
106 if (!inparm) {
107 if (pass)
108 result[count] = param;
109 ++count;
110 inparm = TRUE;
111 }
112 if (pass) {
113 *param++ = blob[n];
114 }
115 }
116 escape = FALSE;
117 }
118
119 if (!pass) {
120 if (count) {
121 result = dlg_calloc(char *, count + 1);
122 assert_ptr(result, "string_to_argv");
123 } else {
124 break; /* no tokens found */
125 }
126 } else {
127 *param = '\0';
128 }
129 }
130 #ifdef HAVE_DLG_TRACE
131 if (result != 0) {
132 for (n = 0; result[n] != 0; ++n) {
133 DLG_TRACE(("#\targv[%d] = %s\n", (int) n, result[n]));
134 }
135 }
136 #endif
137 return result;
138 }
139
140 /*
141 * Count the entries in an argv list.
142 */
143 int
dlg_count_argv(char ** argv)144 dlg_count_argv(char **argv)
145 {
146 int result = 0;
147
148 if (argv != 0) {
149 while (argv[result] != 0)
150 ++result;
151 }
152 return result;
153 }
154
155 int
dlg_eat_argv(int * argcp,char *** argvp,int start,int count)156 dlg_eat_argv(int *argcp, char ***argvp, int start, int count)
157 {
158 int k;
159
160 *argcp -= count;
161 for (k = start; k <= *argcp; k++)
162 (*argvp)[k] = (*argvp)[k + count];
163 (*argvp)[*argcp] = 0;
164 return TRUE;
165 }
166