Fri, 21 Jun 2013 11:42:18 +0200
strings and directives
1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
3 *
4 * Copyright 2013 Mike Becker. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 *
28 */
30 #include <stdio.h>
31 #include <stdlib.h>
32 #include <string.h>
33 #include <fcntl.h>
34 #include <unistd.h>
35 #include <ctype.h>
37 #define INPUTBUF_SIZE 2048
38 #define WORDBUF_SIZE 16
40 #define istype(word, len) (word[len-2] == '_' && word[len-1] == 't')
41 #define isdirective(word) (word[0] == '#')
43 const char* keywords[] = {
44 "auto", "break", "case", "char", "const", "continue", "default", "do",
45 "double", "else", "enum", "extern", "float", "for", "goto", "if", "int",
46 "long", "register", "return", "short", "signed", "sizeof", "static", "struct",
47 "switch", "typedef", "union", "unsigned", "void", "volatile", "while", NULL
48 };
51 typedef struct {
52 size_t count;
53 size_t capacity;
54 size_t maxlinewidth;
55 char** lines;
56 } inputfile_t;
58 inputfile_t *inputfilebuffer(size_t capacity) {
59 inputfile_t *inputfile = (inputfile_t*) malloc(sizeof(inputfile_t));
60 inputfile->lines = (char**) malloc(capacity * sizeof(char*));
61 inputfile->capacity = capacity;
62 inputfile->count = 0;
63 inputfile->maxlinewidth = 0;
65 return inputfile;
66 }
68 void addline(inputfile_t *inputfile, char* line, size_t width) {
69 char *l = (char*) malloc(width+1);
70 memcpy(l, line, width);
71 l[width] = 0;
72 if (inputfile->count >= inputfile->capacity) {
73 inputfile->capacity <<= 1;
74 inputfile->lines = realloc(inputfile->lines, inputfile->capacity);
75 }
76 inputfile->lines[inputfile->count] = l;
77 inputfile->maxlinewidth =
78 width > inputfile->maxlinewidth ? width : inputfile->maxlinewidth;
79 inputfile->count++;
80 }
82 void freeinputfilebuffer(inputfile_t *inputfile) {
83 for (int i = 0 ; i < inputfile->count ; i++) {
84 free(inputfile->lines[i]);
85 }
86 free(inputfile->lines);
87 free(inputfile);
88 }
90 inputfile_t *readinput(char *filename) {
92 int fd = open(filename, O_RDONLY);
93 if (fd == -1) return NULL;
95 inputfile_t *inputfile = inputfilebuffer(512);
97 char buf[INPUTBUF_SIZE];
98 ssize_t r;
100 size_t maxlinewidth = 256;
101 char *line = (char*) malloc(maxlinewidth);
102 size_t col = 0;
104 while ((r = read(fd, buf, INPUTBUF_SIZE)) > 0) {
105 for (size_t i = 0 ; i < r ; i++) {
106 if (col >= maxlinewidth-4) {
107 maxlinewidth <<= 1;
108 line = realloc(line, maxlinewidth);
109 }
111 if (buf[i] == '\n') {
112 line[col++] = '\n';
113 line[col] = 0;
114 addline(inputfile, line, col);
115 col = 0;
116 } else {
117 line[col++] = buf[i];
118 }
119 }
120 }
122 free(line);
124 close(fd);
126 return inputfile;
127 }
129 size_t writeescapedchar(char *dest, size_t dp, char c) {
130 if (c == '>') {
131 dest[dp++] = '&'; dest[dp++] = 'g';
132 dest[dp++] = 't'; dest[dp++] = ';';
133 } else if (c == '<') {
134 dest[dp++] = '&'; dest[dp++] = 'l';
135 dest[dp++] = 't'; dest[dp++] = ';';
136 } else {
137 dest[dp++] = c;
138 }
140 return dp;
141 }
143 int iskeyword(char *word) {
144 for (int i = 0 ; keywords[i] ; i++) {
145 if (strncmp(keywords[i], word, WORDBUF_SIZE) == 0) {
146 return 1;
147 }
148 }
149 return 0;
150 }
152 void parseline(char *src, char *dest) {
153 size_t sp = 0, dp = 0;
154 /* indent */
155 while (isspace(src[sp])) {
156 dest[dp++] = src[sp++];
157 }
158 char word[WORDBUF_SIZE];
159 memset(word, 0, WORDBUF_SIZE);
160 size_t wp = 0;
161 int isstring = 0, iscomment = 0;
162 int isescaping = 0;
163 for (char c = src[sp] ; c ; c=src[++sp]) {
164 /* comments and strings */
165 if (!isescaping && (c == '\'' || c == '\"')) {
166 isstring ^= 1;
167 if (isstring) {
168 memcpy(&(dest[dp]), "<span class=\"c2html-string\">", 28);
169 dp += 28;
170 dp = writeescapedchar(dest, dp, c);
171 } else {
172 dp = writeescapedchar(dest, dp, c);
173 memcpy(&(dest[dp]), "</span>", 7);
174 dp += 7;
175 }
176 } else {
177 if (iscomment || isstring) {
178 dp = writeescapedchar(dest, dp, c);
179 } else if (!isalnum(c) && c != '_' && c != '#') {
180 /* interpret word int_t */
181 if (wp > 0 && wp < WORDBUF_SIZE) {
182 int closespan = 1;
183 if (iskeyword(word)) {
184 memcpy(&(dest[dp]), "<span class=\"c2html-keyword\">", 29);
185 dp += 29;
186 } else if (istype(word, wp)) {
187 memcpy(&(dest[dp]), "<span class=\"c2html-type\">", 26);
188 dp += 26;
189 } else if (isdirective(word)) {
190 memcpy(&(dest[dp]), "<span class=\"c2html-directive\">", 31);
191 dp += 31;
192 } else {
193 closespan = 0;
194 }
195 for (int i = 0 ; i < wp ; i++) {
196 dp = writeescapedchar(dest, dp, word[i]);
197 }
198 if (closespan) {
199 memcpy(&(dest[dp]), "</span>", 7);
200 dp += 7;
201 }
202 memset(word, 0, WORDBUF_SIZE);
203 wp = 0;
204 }
205 dp = writeescapedchar(dest, dp, c);
206 } else {
207 /* read word */
208 if (wp < WORDBUF_SIZE) {
209 word[wp++] = c;
210 } else if (wp == WORDBUF_SIZE) {
211 for (int i = 0 ; i < WORDBUF_SIZE ; i++) {
212 dp = writeescapedchar(dest, dp, word[i]);
213 }
214 wp++;
215 dp = writeescapedchar(dest, dp, c);
216 } else {
217 dp = writeescapedchar(dest, dp, c);
218 }
219 }
220 }
222 isescaping = !isescaping & (c == '\\');
223 }
224 dest[dp] = 0;
225 }
227 void printhelp() {
228 printf("Formats source code using HTML.\n\nUsage:\n"
229 " c2html [FILE...]"
230 "\n");
233 }
235 int lnint(size_t lnc) {
236 int w = 1, p = 1;
237 while ((p*=10) < lnc) w++;
238 return w;
239 }
241 int main(int argc, char** argv) {
243 if (argc == 1) {
244 printhelp();
245 return 0;
246 } else {
248 inputfile_t *inputfile = readinput(argv[1]);
249 if (inputfile) {
250 printf("<pre>\n");
251 char *line = (char*) malloc(inputfile->maxlinewidth*64);
252 int lnw = lnint(inputfile->count);
253 for (int i = 0 ; i < inputfile->count ; i++) {
254 parseline(inputfile->lines[i], line);
255 printf("<span class=\"c2html-lineno\">%*d:</span> %s",
256 lnw, i, line);
257 }
258 free(line);
259 printf("</pre>\n");
260 freeinputfilebuffer(inputfile);
261 }
263 return 0;
264 }
265 }