summaryrefslogtreecommitdiffstats
path: root/src/procfile.c
blob: e2aa605820e4197dc1d9cb1809bcced5f53f21ed (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
#include "common.h"

#define PF_PREFIX "PROCFILE"

#define PFWORDS_INCREASE_STEP 200
#define PFLINES_INCREASE_STEP 10
#define PROCFILE_INCREMENT_BUFFER 512

int procfile_adaptive_initial_allocation = 0;

// if adaptive allocation is set, these store the
// max values we have seen so far
uint32_t procfile_max_lines = PFLINES_INCREASE_STEP;
uint32_t procfile_max_words = PFWORDS_INCREASE_STEP;
size_t procfile_max_allocation = PROCFILE_INCREMENT_BUFFER;

// ----------------------------------------------------------------------------
// An array of words


pfwords *pfwords_add(pfwords *fw, char *str) {
    // debug(D_PROCFILE, PF_PREFIX ":   adding word No %d: '%s'", fw->len, str);

    if(unlikely(fw->len == fw->size)) {
        // debug(D_PROCFILE, PF_PREFIX ":   expanding words");

        fw = reallocz(fw, sizeof(pfwords) + (fw->size + PFWORDS_INCREASE_STEP) * sizeof(char *));
        fw->size += PFWORDS_INCREASE_STEP;
    }

    fw->words[fw->len++] = str;

    return fw;
}

pfwords *pfwords_new(void) {
    // debug(D_PROCFILE, PF_PREFIX ":   initializing words");

    uint32_t size = (procfile_adaptive_initial_allocation) ? procfile_max_words : PFWORDS_INCREASE_STEP;

    pfwords *new = mallocz(sizeof(pfwords) + size * sizeof(char *));
    new->len = 0;
    new->size = size;
    return new;
}

void pfwords_reset(pfwords *fw) {
    // debug(D_PROCFILE, PF_PREFIX ":   reseting words");
    fw->len = 0;
}

void pfwords_free(pfwords *fw) {
    // debug(D_PROCFILE, PF_PREFIX ":   freeing words");

    freez(fw);
}


// ----------------------------------------------------------------------------
// An array of lines

pflines *pflines_add(pflines *fl, uint32_t first_word) {
    // debug(D_PROCFILE, PF_PREFIX ":   adding line %d at word %d", fl->len, first_word);

    if(unlikely(fl->len == fl->size)) {
        // debug(D_PROCFILE, PF_PREFIX ":   expanding lines");

        fl = reallocz(fl, sizeof(pflines) + (fl->size + PFLINES_INCREASE_STEP) * sizeof(ffline));
        fl->size += PFLINES_INCREASE_STEP;
    }

    fl->lines[fl->len].words = 0;
    fl->lines[fl->len++].first = first_word;

    return fl;
}

pflines *pflines_new(void) {
    // debug(D_PROCFILE, PF_PREFIX ":   initializing lines");

    uint32_t size = (unlikely(procfile_adaptive_initial_allocation)) ? procfile_max_words : PFLINES_INCREASE_STEP;

    pflines *new = mallocz(sizeof(pflines) + size * sizeof(ffline));
    new->len = 0;
    new->size = size;
    return new;
}

void pflines_reset(pflines *fl) {
    // debug(D_PROCFILE, PF_PREFIX ":   reseting lines");

    fl->len = 0;
}

void pflines_free(pflines *fl) {
    // debug(D_PROCFILE, PF_PREFIX ":   freeing lines");

    freez(fl);
}


// ----------------------------------------------------------------------------
// The procfile

#define PF_CHAR_IS_SEPARATOR    ' '
#define PF_CHAR_IS_NEWLINE      'N'
#define PF_CHAR_IS_WORD         'W'
#define PF_CHAR_IS_QUOTE        'Q'
#define PF_CHAR_IS_OPEN         'O'
#define PF_CHAR_IS_CLOSE        'C'

void procfile_close(procfile *ff) {
    debug(D_PROCFILE, PF_PREFIX ": Closing file '%s'", ff->filename);

    if(likely(ff->lines)) pflines_free(ff->lines);
    if(likely(ff->words)) pfwords_free(ff->words);

    if(likely(ff->fd != -1)) close(ff->fd);
    freez(ff);
}

procfile *procfile_parser(procfile *ff) {
    debug(D_PROCFILE, PF_PREFIX ": Parsing file '%s'", ff->filename);

    char *s = ff->data, *e = &ff->data[ff->len], *t = ff->data, quote = 0;
    uint32_t l = 0, w = 0;
    int opened = 0;

    ff->lines = pflines_add(ff->lines, w);
    if(unlikely(!ff->lines)) goto cleanup;

    while(likely(s < e)) {
        // we are not at the end

        switch(ff->separators[(uint8_t)(*s)]) {
            case PF_CHAR_IS_OPEN:
                if(s == t) {
                    opened++;
                    t = ++s;
                }
                else if(opened) {
                    opened++;
                    s++;
                }
                else
                    s++;
                continue;

            case PF_CHAR_IS_CLOSE:
                if(opened) {
                    opened--;

                    if(!opened) {
                        *s = '\0';
                        ff->words = pfwords_add(ff->words, t);
                        if(unlikely(!ff->words)) goto cleanup;

                        ff->lines->lines[l].words++;
                        w++;

                        t = ++s;
                    }
                    else
                        s++;
                }
                else
                    s++;
                continue;

            case PF_CHAR_IS_QUOTE:
                if(unlikely(!quote && s == t)) {
                    // quote opened at the beginning
                    quote = *s;
                    t = ++s;
                }
                else if(unlikely(quote && quote == *s)) {
                    // quote closed
                    quote = 0;

                    *s = '\0';
                    ff->words = pfwords_add(ff->words, t);
                    if(unlikely(!ff->words)) goto cleanup;

                    ff->lines->lines[l].words++;
                    w++;

                    t = ++s;
                }
                else
                    s++;
                continue;

            case PF_CHAR_IS_SEPARATOR:
                if(unlikely(quote || opened)) {
                    // we are inside a quote
                    s++;
                    continue;
                }

                if(unlikely(s == t)) {
                    // skip all leading white spaces
                    t = ++s;
                    continue;
                }

                // end of word
                *s = '\0';

                ff->words = pfwords_add(ff->words, t);
                if(unlikely(!ff->words)) goto cleanup;

                ff->lines->lines[l].words++;
                w++;

                t = ++s;
                continue;

            case PF_CHAR_IS_NEWLINE:
                // end of line
                *s = '\0';

                ff->words = pfwords_add(ff->words, t);
                if(unlikely(!ff->words)) goto cleanup;

                ff->lines->lines[l].words++;
                w++;

                // debug(D_PROCFILE, PF_PREFIX ":   ended line %d with %d words", l, ff->lines->lines[l].words);

                ff->lines = pflines_add(ff->lines, w);
                if(unlikely(!ff->lines)) goto cleanup;
                l++;

                t = ++s;
                continue;

            default:
                s++;
                continue;
        }
    }

    if(likely(s > t && t < e)) {
        // the last word
        if(likely(ff->len < ff->size))
            *s = '\0';
        else {
            // we are going to loose the last byte
            ff->data[ff->size - 1] = '\0';
        }

        ff->words = pfwords_add(ff->words, t);
        if(unlikely(!ff->words)) goto cleanup;

        ff->lines->lines[l].words++;
        w++;
    }

    return ff;

cleanup:
    error(PF_PREFIX ": Failed to parse file '%s'", ff->filename);
    procfile_close(ff);
    return NULL;
}

procfile *procfile_readall(procfile *ff) {
    debug(D_PROCFILE, PF_PREFIX ": Reading file '%s'.", ff->filename);

    ssize_t s, r = 1, x;
    ff->len = 0;

    while(likely(r > 0)) {
        s = ff->len;
        x = ff->size - s;

        if(!x) {
            debug(D_PROCFILE, PF_PREFIX ": Expanding data buffer for file '%s'.", ff->filename);

            ff = reallocz(ff, sizeof(procfile) + ff->size + PROCFILE_INCREMENT_BUFFER);
            ff->size += PROCFILE_INCREMENT_BUFFER;
        }

        debug(D_PROCFILE, "Reading file '%s', from position %ld with length %lu", ff->filename, s, ff->size - s);
        r = read(ff->fd, &ff->data[s], ff->size - s);
        if(unlikely(r == -1)) {
            if(unlikely(!(ff->flags & PROCFILE_FLAG_NO_ERROR_ON_FILE_IO))) error(PF_PREFIX ": Cannot read from file '%s'", ff->filename);
            procfile_close(ff);
            return NULL;
        }

        ff->len += r;
    }

    debug(D_PROCFILE, "Rewinding file '%s'", ff->filename);
    if(unlikely(lseek(ff->fd, 0, SEEK_SET) == -1)) {
        if(unlikely(!(ff->flags & PROCFILE_FLAG_NO_ERROR_ON_FILE_IO))) error(PF_PREFIX ": Cannot rewind on file '%s'.", ff->filename);
        procfile_close(ff);
        return NULL;
    }

    pflines_reset(ff->lines);
    pfwords_reset(ff->words);

    ff = procfile_parser(ff);

    if(unlikely(procfile_adaptive_initial_allocation)) {
        if(unlikely(ff->len > procfile_max_allocation)) procfile_max_allocation = ff->len;
        if(unlikely(ff->lines->len > procfile_max_lines)) procfile_max_lines = ff->lines->len;
        if(unlikely(ff->words->len > procfile_max_words)) procfile_max_words = ff->words->len;
    }

    debug(D_PROCFILE, "File '%s' updated.", ff->filename);
    return ff;
}

static void procfile_set_separators(procfile *ff, const char *separators) {
    static char def[256] = { [0 ... 255] = 0 };
    int i;

    if(unlikely(!def[255])) {
        // this is thread safe
        // we check that the last byte is non-zero
        // if it is zero, multiple threads may be executing this at the same time
        // setting in def[] the exact same values
        for(i = 0; likely(i < 256) ;i++) {
            if(unlikely(i == '\n' || i == '\r')) def[i] = PF_CHAR_IS_NEWLINE;
            else if(unlikely(isspace(i) || !isprint(i))) def[i] = PF_CHAR_IS_SEPARATOR;
            else def[i] = PF_CHAR_IS_WORD;
        }
    }

    // copy the default
    char *ffs = ff->separators, *ffd = def, *ffe = &def[256];
    while(likely(ffd != ffe)) *ffs++ = *ffd++;

    // set the separators
    if(unlikely(!separators))
        separators = " \t=|";

    ffs = ff->separators;
    const char *s = separators;
    while(likely(*s))
        ffs[(int)*s++] = PF_CHAR_IS_SEPARATOR;
}

void procfile_set_quotes(procfile *ff, const char *quotes) {
    // remove all quotes
    int i;
    for(i = 0; i < 256 ; i++)
        if(ff->separators[i] == PF_CHAR_IS_QUOTE)
            ff->separators[i] = PF_CHAR_IS_WORD;

    // if nothing given, return
    if(unlikely(!quotes || !*quotes))
        return;

    // set the quotes
    char *ffs = ff->separators;
    const char *s = quotes;
    while(likely(*s))
        ffs[(int)*s++] = PF_CHAR_IS_QUOTE;
}

void procfile_set_open_close(procfile *ff, const char *open, const char *close) {
    // remove all open/close
    int i;
    for(i = 0; i < 256 ; i++)
        if(ff->separators[i] == PF_CHAR_IS_OPEN || ff->separators[i] == PF_CHAR_IS_CLOSE)
            ff->separators[i] = PF_CHAR_IS_WORD;

    // if nothing given, return
    if(unlikely(!open || !*open || !close || !*close))
        return;

    // set the openings
    char *ffs = ff->separators;
    const char *s = open;
    while(likely(*s))
        ffs[(int)*s++] = PF_CHAR_IS_OPEN;

    s = close;
    while(likely(*s))
        ffs[(int)*s++] = PF_CHAR_IS_CLOSE;
}

procfile *procfile_open(const char *filename, const char *separators, uint32_t flags) {
    debug(D_PROCFILE, PF_PREFIX ": Opening file '%s'", filename);

    int fd = open(filename, O_RDONLY, 0666);
    if(unlikely(fd == -1)) {
        if(unlikely(!(flags & PROCFILE_FLAG_NO_ERROR_ON_FILE_IO))) error(PF_PREFIX ": Cannot open file '%s'", filename);
        return NULL;
    }

    size_t size = (unlikely(procfile_adaptive_initial_allocation)) ? procfile_max_allocation : PROCFILE_INCREMENT_BUFFER;
    procfile *ff = mallocz(sizeof(procfile) + size);
    strncpyz(ff->filename, filename, FILENAME_MAX);

    ff->fd = fd;
    ff->size = size;
    ff->len = 0;
    ff->flags = flags;

    ff->lines = pflines_new();
    ff->words = pfwords_new();

    if(unlikely(!ff->lines || !ff->words)) {
        error(PF_PREFIX ": Cannot initialize parser for file '%s'", filename);
        procfile_close(ff);
        return NULL;
    }

    procfile_set_separators(ff, separators);

    debug(D_PROCFILE, "File '%s' opened.", filename);
    return ff;
}

procfile *procfile_reopen(procfile *ff, const char *filename, const char *separators, uint32_t flags) {
    if(unlikely(!ff)) return procfile_open(filename, separators, flags);

    if(likely(ff->fd != -1)) close(ff->fd);

    ff->fd = open(filename, O_RDONLY, 0666);
    if(unlikely(ff->fd == -1)) {
        procfile_close(ff);
        return NULL;
    }

    strncpyz(ff->filename, filename, FILENAME_MAX);

    ff->flags = flags;

    // do not do the separators again if NULL is given
    if(likely(separators)) procfile_set_separators(ff, separators);

    return ff;
}

// ----------------------------------------------------------------------------
// example parsing of procfile data

void procfile_print(procfile *ff) {
    uint32_t lines = procfile_lines(ff), l;
    uint32_t words, w;
    char *s;

    debug(D_PROCFILE, "File '%s' with %u lines and %u words", ff->filename, ff->lines->len, ff->words->len);

    for(l = 0; likely(l < lines) ;l++) {
        words = procfile_linewords(ff, l);

        debug(D_PROCFILE, " line %u starts at word %u and has %u words", l, ff->lines->lines[l].first, ff->lines->lines[l].words);

        for(w = 0; likely(w < words) ;w++) {
            s = procfile_lineword(ff, l, w);
            debug(D_PROCFILE, "     [%u.%u] '%s'", l, w, s);
        }
    }
}