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authorDenis Vlasenko <vda.linux@googlemail.com>2007-11-13 22:22:29 +0000
committerDenis Vlasenko <vda.linux@googlemail.com>2007-11-13 22:22:29 +0000
commit3d461676a90eecf584dc07317cdb52eba96aa2d9 (patch)
tree7e2a706b4d19a27312be5f036dd557ea518a7790 /coreutils/tr.c
parenta89d50fb9addfe0060f697a7e1d31a7b3010b2bb (diff)
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tr: better comments, small code shrink
function old new delta expand 2232 2230 -2 tr_main 677 655 -22
Diffstat (limited to 'coreutils/tr.c')
-rw-r--r--coreutils/tr.c107
1 files changed, 60 insertions, 47 deletions
diff --git a/coreutils/tr.c b/coreutils/tr.c
index e60e08b25..f6f458bf0 100644
--- a/coreutils/tr.c
+++ b/coreutils/tr.c
@@ -42,19 +42,46 @@ static void map(char *pvector,
42} 42}
43 43
44/* supported constructs: 44/* supported constructs:
45 * Ranges, e.g., [0-9] ==> 0123456789 45 * Ranges, e.g., 0-9 ==> 0123456789
46 * Escapes, e.g., \a ==> Control-G 46 * Ranges, e.g., [0-9] ==> 0123456789
47 * Character classes, e.g. [:upper:] ==> A ... Z 47 * Escapes, e.g., \a ==> Control-G
48 * Character classes, e.g. [:upper:] ==> A...Z
49 * Equiv classess, e.g. [=A=] ==> A (hmmmmmmm?)
48 */ 50 */
49static unsigned int expand(const char *arg, char *buffer) 51static unsigned int expand(const char *arg, char *buffer)
50{ 52{
51 char *buffer_start = buffer; 53 char *buffer_start = buffer;
52 unsigned i; /* XXX: FIXME: use unsigned char? */ 54 unsigned i; /* can't be unsigned char: must be able to hold 256 */
53 unsigned char ac; 55 unsigned char ac;
56
57 while (*arg) {
58 if (*arg == '\\') {
59 arg++;
60 *buffer++ = bb_process_escape_sequence(&arg);
61 continue;
62 }
63 if (arg[1] == '-') { /* "0-9..." */
64 ac = arg[2];
65 if (ac == '\0') { /* "0-": copy verbatim */
66 *buffer++ = *arg++; /* copy '0' */
67 continue; /* next iter will copy '-' and stop */
68 }
69 i = *arg;
70 while (i <= ac) /* ok: i is unsigned _int_ */
71 *buffer++ = i++;
72 arg += 3; /* skip 0-9 */
73 continue;
74 }
75 if (*arg == '[') { /* "[xyz..." */
76 arg++;
77 i = *arg++;
78 /* "[xyz...", i=x, arg points to y */
79 if (ENABLE_FEATURE_TR_CLASSES && i == ':') {
54#define CLO ":]\0" 80#define CLO ":]\0"
55 static const char classes[] ALIGN1 = 81 static const char classes[] ALIGN1 =
56 "alpha"CLO "alnum"CLO "digit"CLO "lower"CLO "upper"CLO "space"CLO 82 "alpha"CLO "alnum"CLO "digit"CLO
57 "blank"CLO "punct"CLO "cntrl"CLO; 83 "lower"CLO "upper"CLO "space"CLO
84 "blank"CLO "punct"CLO "cntrl"CLO;
58#define CLASS_invalid 0 /* we increment the retval */ 85#define CLASS_invalid 0 /* we increment the retval */
59#define CLASS_alpha 1 86#define CLASS_alpha 1
60#define CLASS_alnum 2 87#define CLASS_alnum 2
@@ -68,27 +95,9 @@ static unsigned int expand(const char *arg, char *buffer)
68//#define CLASS_xdigit 10 95//#define CLASS_xdigit 10
69//#define CLASS_graph 11 96//#define CLASS_graph 11
70//#define CLASS_print 12 97//#define CLASS_print 12
71 while (*arg) {
72 if (*arg == '\\') {
73 arg++;
74 *buffer++ = bb_process_escape_sequence(&arg);
75 } else if (*(arg+1) == '-') {
76 ac = *(arg+2);
77 if (ac == 0) {
78 *buffer++ = *arg++;
79 continue;
80 }
81 i = *arg;
82 while (i <= ac)
83 *buffer++ = i++;
84 arg += 3; /* Skip the assumed a-z */
85 } else if (*arg == '[') {
86 arg++;
87 i = *arg++;
88 if (ENABLE_FEATURE_TR_CLASSES && i == ':') {
89 smalluint j; 98 smalluint j;
90 { /* not really pretty.. */ 99 { /* not really pretty.. */
91 char *tmp = xstrndup(arg, 7); // warning: xdigit needs 8, not 7 100 char *tmp = xstrndup(arg, 7); // warning: xdigit would need 8, not 7
92 j = index_in_strings(classes, tmp) + 1; 101 j = index_in_strings(classes, tmp) + 1;
93 free(tmp); 102 free(tmp);
94 } 103 }
@@ -115,10 +124,9 @@ static unsigned int expand(const char *arg, char *buffer)
115 *buffer++ = ' '; 124 *buffer++ = ' ';
116 } 125 }
117 if (j == CLASS_punct || j == CLASS_cntrl) { 126 if (j == CLASS_punct || j == CLASS_cntrl) {
118 for (i = 0; i <= ASCII; i++) 127 for (i = '\0'; i <= ASCII; i++)
119 if ((j == CLASS_punct && 128 if ((j == CLASS_punct && isprint(i) && !isalnum(i) && !isspace(i))
120 isprint(i) && (!isalnum(i)) && (!isspace(i))) || 129 || (j == CLASS_cntrl && iscntrl(i)))
121 (j == CLASS_cntrl && iscntrl(i)))
122 *buffer++ = i; 130 *buffer++ = i;
123 } 131 }
124 if (j == CLASS_invalid) { 132 if (j == CLASS_invalid) {
@@ -128,22 +136,26 @@ static unsigned int expand(const char *arg, char *buffer)
128 } 136 }
129 break; 137 break;
130 } 138 }
131 if (ENABLE_FEATURE_TR_EQUIV && i == '=') { 139 /* "[xyz...", i=x, arg points to y */
132 *buffer++ = *arg; 140 if (ENABLE_FEATURE_TR_EQUIV && i == '=') { /* [=CHAR=] */
133 arg += 3; /* Skip the closing =] */ 141 *buffer++ = *arg; /* copy CHAR */
142 arg += 3; /* skip CHAR=] */
134 continue; 143 continue;
135 } 144 }
136 if (*arg++ != '-') { 145 if (*arg != '-') { /* not [x-...] - copy verbatim */
137 *buffer++ = '['; 146 *buffer++ = '[';
138 arg -= 2; 147 arg--; /* points to x */
139 continue; 148 continue; /* copy all, including eventual ']' */
140 } 149 }
150 /* [x-y...] */
151 arg++;
141 ac = *arg++; 152 ac = *arg++;
142 while (i <= ac) 153 while (i <= ac)
143 *buffer++ = i++; 154 *buffer++ = i++;
144 arg++; /* Skip the assumed ']' */ 155 arg++; /* skip the assumed ']' */
145 } else 156 continue;
146 *buffer++ = *arg++; 157 }
158 *buffer++ = *arg++;
147 } 159 }
148 return (buffer - buffer_start); 160 return (buffer - buffer_start);
149} 161}
@@ -154,7 +166,7 @@ static int complement(char *buffer, int buffer_len)
154 char conv[ASCII + 2]; 166 char conv[ASCII + 2];
155 167
156 ix = 0; 168 ix = 0;
157 for (i = 0; i <= ASCII; i++) { 169 for (i = '\0'; i <= ASCII; i++) {
158 for (j = 0; j < buffer_len; j++) 170 for (j = 0; j < buffer_len; j++)
159 if (buffer[j] == i) 171 if (buffer[j] == i)
160 break; 172 break;
@@ -174,7 +186,9 @@ int tr_main(int argc, char **argv)
174 int i; 186 int i;
175 smalluint flags = 0; 187 smalluint flags = 0;
176 ssize_t read_chars = 0; 188 ssize_t read_chars = 0;
177 size_t in_index = 0, out_index = 0, c, coded, last = -1; 189 size_t in_index = 0, out_index = 0;
190 unsigned last = UCHAR_MAX + 1; /* not equal to any char */
191 unsigned char coded, c;
178 RESERVE_CONFIG_UBUFFER(output, BUFSIZ); 192 RESERVE_CONFIG_UBUFFER(output, BUFSIZ);
179 RESERVE_CONFIG_BUFFER(vector, ASCII+1); 193 RESERVE_CONFIG_BUFFER(vector, ASCII+1);
180 RESERVE_CONFIG_BUFFER(invec, ASCII+1); 194 RESERVE_CONFIG_BUFFER(invec, ASCII+1);
@@ -203,8 +217,8 @@ int tr_main(int argc, char **argv)
203 input_length = expand(argv[idx++], tr_buf); 217 input_length = expand(argv[idx++], tr_buf);
204 if (flags & TR_OPT_complement) 218 if (flags & TR_OPT_complement)
205 input_length = complement(tr_buf, input_length); 219 input_length = complement(tr_buf, input_length);
206 if (argv[idx] != NULL) { 220 if (argv[idx]) {
207 if (*argv[idx] == '\0') 221 if (argv[idx][0] == '\0')
208 bb_error_msg_and_die("STRING2 cannot be empty"); 222 bb_error_msg_and_die("STRING2 cannot be empty");
209 output_length = expand(argv[idx], output); 223 output_length = expand(argv[idx], output);
210 map(vector, tr_buf, input_length, output, output_length); 224 map(vector, tr_buf, input_length, output, output_length);
@@ -222,9 +236,8 @@ int tr_main(int argc, char **argv)
222 xwrite(STDOUT_FILENO, (char *)output, out_index); 236 xwrite(STDOUT_FILENO, (char *)output, out_index);
223 out_index = 0; 237 out_index = 0;
224 } 238 }
225 read_chars = read(STDIN_FILENO, tr_buf, BUFSIZ); 239 read_chars = safe_read(STDIN_FILENO, tr_buf, BUFSIZ);
226 if (read_chars <= 0) { 240 if (read_chars <= 0) {
227 xwrite(STDOUT_FILENO, (char *)output, out_index);
228 if (read_chars < 0) 241 if (read_chars < 0)
229 bb_perror_msg_and_die(bb_msg_read_error); 242 bb_perror_msg_and_die(bb_msg_read_error);
230 exit(EXIT_SUCCESS); 243 exit(EXIT_SUCCESS);
@@ -235,8 +248,8 @@ int tr_main(int argc, char **argv)
235 coded = vector[c]; 248 coded = vector[c];
236 if ((flags & TR_OPT_delete) && invec[c]) 249 if ((flags & TR_OPT_delete) && invec[c])
237 continue; 250 continue;
238 if ((flags & TR_OPT_squeeze_reps) && last == coded && 251 if ((flags & TR_OPT_squeeze_reps) && last == coded
239 (invec[c] || outvec[coded])) 252 && (invec[c] || outvec[coded]))
240 continue; 253 continue;
241 output[out_index++] = last = coded; 254 output[out_index++] = last = coded;
242 } 255 }
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-03-17 02:01:45 +0000