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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include <stdint.h> | |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
24 | #include <strings.h> | |
25 | #include <errno.h> | |
26 | #include "libsigrok.h" | |
27 | #include "libsigrok-internal.h" | |
28 | ||
29 | /** @cond PRIVATE */ | |
30 | #define LOG_PREFIX "strutil" | |
31 | /** @endcond */ | |
32 | ||
33 | /** | |
34 | * @file | |
35 | * | |
36 | * Helper functions for handling or converting libsigrok-related strings. | |
37 | */ | |
38 | ||
39 | /** | |
40 | * @defgroup grp_strutil String utilities | |
41 | * | |
42 | * Helper functions for handling or converting libsigrok-related strings. | |
43 | * | |
44 | * @{ | |
45 | */ | |
46 | ||
47 | /** | |
48 | * @private | |
49 | * | |
50 | * Convert a string representation of a numeric value (base 10) to a long integer. The | |
51 | * conversion is strict and will fail if the complete string does not represent | |
52 | * a valid long integer. The function sets errno according to the details of the | |
53 | * failure. | |
54 | * | |
55 | * @param str The string representation to convert. | |
56 | * @param ret Pointer to long where the result of the conversion will be stored. | |
57 | * | |
58 | * @retval SR_OK Conversion successful. | |
59 | * @retval SR_ERR Failure. | |
60 | * | |
61 | * @since 0.3.0 | |
62 | */ | |
63 | SR_PRIV int sr_atol(const char *str, long *ret) | |
64 | { | |
65 | long tmp; | |
66 | char *endptr = NULL; | |
67 | ||
68 | errno = 0; | |
69 | tmp = strtol(str, &endptr, 10); | |
70 | ||
71 | if (!endptr || *endptr || errno) { | |
72 | if (!errno) | |
73 | errno = EINVAL; | |
74 | return SR_ERR; | |
75 | } | |
76 | ||
77 | *ret = tmp; | |
78 | return SR_OK; | |
79 | } | |
80 | ||
81 | /** | |
82 | * @private | |
83 | * | |
84 | * Convert a string representation of a numeric value (base 10) to an integer. The | |
85 | * conversion is strict and will fail if the complete string does not represent | |
86 | * a valid integer. The function sets errno according to the details of the | |
87 | * failure. | |
88 | * | |
89 | * @param str The string representation to convert. | |
90 | * @param ret Pointer to int where the result of the conversion will be stored. | |
91 | * | |
92 | * @retval SR_OK Conversion successful. | |
93 | * @retval SR_ERR Failure. | |
94 | * | |
95 | * @since 0.3.0 | |
96 | */ | |
97 | SR_PRIV int sr_atoi(const char *str, int *ret) | |
98 | { | |
99 | long tmp; | |
100 | ||
101 | if (sr_atol(str, &tmp) != SR_OK) | |
102 | return SR_ERR; | |
103 | ||
104 | if ((int) tmp != tmp) { | |
105 | errno = ERANGE; | |
106 | return SR_ERR; | |
107 | } | |
108 | ||
109 | *ret = (int) tmp; | |
110 | return SR_OK; | |
111 | } | |
112 | ||
113 | /** | |
114 | * @private | |
115 | * | |
116 | * Convert a string representation of a numeric value to a double. The | |
117 | * conversion is strict and will fail if the complete string does not represent | |
118 | * a valid double. The function sets errno according to the details of the | |
119 | * failure. | |
120 | * | |
121 | * @param str The string representation to convert. | |
122 | * @param ret Pointer to double where the result of the conversion will be stored. | |
123 | * | |
124 | * @retval SR_OK Conversion successful. | |
125 | * @retval SR_ERR Failure. | |
126 | * | |
127 | * @since 0.3.0 | |
128 | */ | |
129 | SR_PRIV int sr_atod(const char *str, double *ret) | |
130 | { | |
131 | double tmp; | |
132 | char *endptr = NULL; | |
133 | ||
134 | errno = 0; | |
135 | tmp = strtof(str, &endptr); | |
136 | ||
137 | if (!endptr || *endptr || errno) { | |
138 | if (!errno) | |
139 | errno = EINVAL; | |
140 | return SR_ERR; | |
141 | } | |
142 | ||
143 | *ret = tmp; | |
144 | return SR_OK; | |
145 | } | |
146 | ||
147 | /** | |
148 | * @private | |
149 | * | |
150 | * Convert a string representation of a numeric value to a float. The | |
151 | * conversion is strict and will fail if the complete string does not represent | |
152 | * a valid float. The function sets errno according to the details of the | |
153 | * failure. | |
154 | * | |
155 | * @param str The string representation to convert. | |
156 | * @param ret Pointer to float where the result of the conversion will be stored. | |
157 | * | |
158 | * @retval SR_OK Conversion successful. | |
159 | * @retval SR_ERR Failure. | |
160 | * | |
161 | * @since 0.3.0 | |
162 | */ | |
163 | SR_PRIV int sr_atof(const char *str, float *ret) | |
164 | { | |
165 | double tmp; | |
166 | ||
167 | if (sr_atod(str, &tmp) != SR_OK) | |
168 | return SR_ERR; | |
169 | ||
170 | if ((float) tmp != tmp) { | |
171 | errno = ERANGE; | |
172 | return SR_ERR; | |
173 | } | |
174 | ||
175 | *ret = (float) tmp; | |
176 | return SR_OK; | |
177 | } | |
178 | ||
179 | /** | |
180 | * @private | |
181 | * | |
182 | * Convert a string representation of a numeric value to a float. The | |
183 | * conversion is strict and will fail if the complete string does not represent | |
184 | * a valid float. The function sets errno according to the details of the | |
185 | * failure. This version ignores the locale. | |
186 | * | |
187 | * @param str The string representation to convert. | |
188 | * @param ret Pointer to float where the result of the conversion will be stored. | |
189 | * | |
190 | * @retval SR_OK Conversion successful. | |
191 | * @retval SR_ERR Failure. | |
192 | * | |
193 | * @since 0.3.0 | |
194 | */ | |
195 | SR_PRIV int sr_atof_ascii(const char *str, float *ret) | |
196 | { | |
197 | double tmp; | |
198 | char *endptr = NULL; | |
199 | ||
200 | errno = 0; | |
201 | tmp = g_ascii_strtod(str, &endptr); | |
202 | ||
203 | if (!endptr || *endptr || errno) { | |
204 | if (!errno) | |
205 | errno = EINVAL; | |
206 | return SR_ERR; | |
207 | } | |
208 | ||
209 | /* FIXME This fails unexpectedly. Some other method to safel downcast | |
210 | * needs to be found. Checking against FLT_MAX doesn't work as well. */ | |
211 | /* | |
212 | if ((float) tmp != tmp) { | |
213 | errno = ERANGE; | |
214 | sr_dbg("ERANGEEEE %e != %e", (float) tmp, tmp); | |
215 | return SR_ERR; | |
216 | } | |
217 | */ | |
218 | ||
219 | *ret = (float) tmp; | |
220 | return SR_OK; | |
221 | } | |
222 | ||
223 | /** | |
224 | * Convert a numeric value value to its "natural" string representation | |
225 | * in SI units. | |
226 | * | |
227 | * E.g. a value of 3000000, with units set to "W", would be converted | |
228 | * to "3 MW", 20000 to "20 kW", 31500 would become "31.5 kW". | |
229 | * | |
230 | * @param x The value to convert. | |
231 | * @param unit The unit to append to the string, or NULL if the string | |
232 | * has no units. | |
233 | * | |
234 | * @return A newly allocated string representation of the samplerate value, | |
235 | * or NULL upon errors. The caller is responsible to g_free() the | |
236 | * memory. | |
237 | * | |
238 | * @since 0.2.0 | |
239 | */ | |
240 | SR_API char *sr_si_string_u64(uint64_t x, const char *unit) | |
241 | { | |
242 | uint8_t i; | |
243 | uint64_t quot, divisor[] = { | |
244 | SR_HZ(1), SR_KHZ(1), SR_MHZ(1), SR_GHZ(1), | |
245 | SR_GHZ(1000), SR_GHZ(1000 * 1000), SR_GHZ(1000 * 1000 * 1000), | |
246 | }; | |
247 | const char *p, prefix[] = "\0kMGTPE"; | |
248 | char fmt[16], fract[20] = "", *f; | |
249 | ||
250 | if (!unit) | |
251 | unit = ""; | |
252 | ||
253 | for (i = 0; (quot = x / divisor[i]) >= 1000; i++); | |
254 | ||
255 | if (i) { | |
256 | sprintf(fmt, ".%%0%d"PRIu64, i * 3); | |
257 | f = fract + sprintf(fract, fmt, x % divisor[i]) - 1; | |
258 | ||
259 | while (f >= fract && strchr("0.", *f)) | |
260 | *f-- = 0; | |
261 | } | |
262 | ||
263 | p = prefix + i; | |
264 | ||
265 | return g_strdup_printf("%" PRIu64 "%s %.1s%s", quot, fract, p, unit); | |
266 | } | |
267 | ||
268 | /** | |
269 | * Convert a numeric samplerate value to its "natural" string representation. | |
270 | * | |
271 | * E.g. a value of 3000000 would be converted to "3 MHz", 20000 to "20 kHz", | |
272 | * 31500 would become "31.5 kHz". | |
273 | * | |
274 | * @param samplerate The samplerate in Hz. | |
275 | * | |
276 | * @return A newly allocated string representation of the samplerate value, | |
277 | * or NULL upon errors. The caller is responsible to g_free() the | |
278 | * memory. | |
279 | * | |
280 | * @since 0.1.0 | |
281 | */ | |
282 | SR_API char *sr_samplerate_string(uint64_t samplerate) | |
283 | { | |
284 | return sr_si_string_u64(samplerate, "Hz"); | |
285 | } | |
286 | ||
287 | /** | |
288 | * Convert a numeric frequency value to the "natural" string representation | |
289 | * of its period. | |
290 | * | |
291 | * E.g. a value of 3000000 would be converted to "3 us", 20000 to "50 ms". | |
292 | * | |
293 | * @param frequency The frequency in Hz. | |
294 | * | |
295 | * @return A newly allocated string representation of the frequency value, | |
296 | * or NULL upon errors. The caller is responsible to g_free() the | |
297 | * memory. | |
298 | * | |
299 | * @since 0.1.0 | |
300 | */ | |
301 | SR_API char *sr_period_string(uint64_t frequency) | |
302 | { | |
303 | char *o; | |
304 | int r; | |
305 | ||
306 | /* Allocate enough for a uint64_t as string + " ms". */ | |
307 | o = g_malloc0(30 + 1); | |
308 | ||
309 | if (frequency >= SR_GHZ(1)) | |
310 | r = snprintf(o, 30, "%" PRIu64 " ns", frequency / 1000000000); | |
311 | else if (frequency >= SR_MHZ(1)) | |
312 | r = snprintf(o, 30, "%" PRIu64 " us", frequency / 1000000); | |
313 | else if (frequency >= SR_KHZ(1)) | |
314 | r = snprintf(o, 30, "%" PRIu64 " ms", frequency / 1000); | |
315 | else | |
316 | r = snprintf(o, 30, "%" PRIu64 " s", frequency); | |
317 | ||
318 | if (r < 0) { | |
319 | /* Something went wrong... */ | |
320 | g_free(o); | |
321 | return NULL; | |
322 | } | |
323 | ||
324 | return o; | |
325 | } | |
326 | ||
327 | /** | |
328 | * Convert a numeric voltage value to the "natural" string representation | |
329 | * of its voltage value. The voltage is specified as a rational number's | |
330 | * numerator and denominator. | |
331 | * | |
332 | * E.g. a value of 300000 would be converted to "300mV", 2 to "2V". | |
333 | * | |
334 | * @param v_p The voltage numerator. | |
335 | * @param v_q The voltage denominator. | |
336 | * | |
337 | * @return A newly allocated string representation of the voltage value, | |
338 | * or NULL upon errors. The caller is responsible to g_free() the | |
339 | * memory. | |
340 | * | |
341 | * @since 0.2.0 | |
342 | */ | |
343 | SR_API char *sr_voltage_string(uint64_t v_p, uint64_t v_q) | |
344 | { | |
345 | int r; | |
346 | char *o; | |
347 | ||
348 | o = g_malloc0(30 + 1); | |
349 | ||
350 | if (v_q == 1000) | |
351 | r = snprintf(o, 30, "%" PRIu64 "mV", v_p); | |
352 | else if (v_q == 1) | |
353 | r = snprintf(o, 30, "%" PRIu64 "V", v_p); | |
354 | else | |
355 | r = snprintf(o, 30, "%gV", (float)v_p / (float)v_q); | |
356 | ||
357 | if (r < 0) { | |
358 | /* Something went wrong... */ | |
359 | g_free(o); | |
360 | return NULL; | |
361 | } | |
362 | ||
363 | return o; | |
364 | } | |
365 | ||
366 | /** | |
367 | * Convert a "natural" string representation of a size value to uint64_t. | |
368 | * | |
369 | * E.g. a value of "3k" or "3 K" would be converted to 3000, a value | |
370 | * of "15M" would be converted to 15000000. | |
371 | * | |
372 | * Value representations other than decimal (such as hex or octal) are not | |
373 | * supported. Only 'k' (kilo), 'm' (mega), 'g' (giga) suffixes are supported. | |
374 | * Spaces (but not other whitespace) between value and suffix are allowed. | |
375 | * | |
376 | * @param sizestring A string containing a (decimal) size value. | |
377 | * @param size Pointer to uint64_t which will contain the string's size value. | |
378 | * | |
379 | * @return SR_OK upon success, SR_ERR upon errors. | |
380 | * | |
381 | * @since 0.1.0 | |
382 | */ | |
383 | SR_API int sr_parse_sizestring(const char *sizestring, uint64_t *size) | |
384 | { | |
385 | int multiplier, done; | |
386 | double frac_part; | |
387 | char *s; | |
388 | ||
389 | *size = strtoull(sizestring, &s, 10); | |
390 | multiplier = 0; | |
391 | frac_part = 0; | |
392 | done = FALSE; | |
393 | while (s && *s && multiplier == 0 && !done) { | |
394 | switch (*s) { | |
395 | case ' ': | |
396 | break; | |
397 | case '.': | |
398 | frac_part = g_ascii_strtod(s, &s); | |
399 | break; | |
400 | case 'k': | |
401 | case 'K': | |
402 | multiplier = SR_KHZ(1); | |
403 | break; | |
404 | case 'm': | |
405 | case 'M': | |
406 | multiplier = SR_MHZ(1); | |
407 | break; | |
408 | case 'g': | |
409 | case 'G': | |
410 | multiplier = SR_GHZ(1); | |
411 | break; | |
412 | default: | |
413 | done = TRUE; | |
414 | s--; | |
415 | } | |
416 | s++; | |
417 | } | |
418 | if (multiplier > 0) { | |
419 | *size *= multiplier; | |
420 | *size += frac_part * multiplier; | |
421 | } else | |
422 | *size += frac_part; | |
423 | ||
424 | if (s && *s && strcasecmp(s, "Hz")) | |
425 | return SR_ERR; | |
426 | ||
427 | return SR_OK; | |
428 | } | |
429 | ||
430 | /** | |
431 | * Convert a "natural" string representation of a time value to an | |
432 | * uint64_t value in milliseconds. | |
433 | * | |
434 | * E.g. a value of "3s" or "3 s" would be converted to 3000, a value | |
435 | * of "15ms" would be converted to 15. | |
436 | * | |
437 | * Value representations other than decimal (such as hex or octal) are not | |
438 | * supported. Only lower-case "s" and "ms" time suffixes are supported. | |
439 | * Spaces (but not other whitespace) between value and suffix are allowed. | |
440 | * | |
441 | * @param timestring A string containing a (decimal) time value. | |
442 | * @return The string's time value as uint64_t, in milliseconds. | |
443 | * | |
444 | * @todo Add support for "m" (minutes) and others. | |
445 | * @todo Add support for picoseconds? | |
446 | * @todo Allow both lower-case and upper-case? If no, document it. | |
447 | * | |
448 | * @since 0.1.0 | |
449 | */ | |
450 | SR_API uint64_t sr_parse_timestring(const char *timestring) | |
451 | { | |
452 | uint64_t time_msec; | |
453 | char *s; | |
454 | ||
455 | /* TODO: Error handling, logging. */ | |
456 | ||
457 | time_msec = strtoull(timestring, &s, 10); | |
458 | if (time_msec == 0 && s == timestring) | |
459 | return 0; | |
460 | ||
461 | if (s && *s) { | |
462 | while (*s == ' ') | |
463 | s++; | |
464 | if (!strcmp(s, "s")) | |
465 | time_msec *= 1000; | |
466 | else if (!strcmp(s, "ms")) | |
467 | ; /* redundant */ | |
468 | else | |
469 | return 0; | |
470 | } | |
471 | ||
472 | return time_msec; | |
473 | } | |
474 | ||
475 | /** @since 0.1.0 */ | |
476 | SR_API gboolean sr_parse_boolstring(const char *boolstr) | |
477 | { | |
478 | if (!boolstr) | |
479 | return FALSE; | |
480 | ||
481 | if (!g_ascii_strncasecmp(boolstr, "true", 4) || | |
482 | !g_ascii_strncasecmp(boolstr, "yes", 3) || | |
483 | !g_ascii_strncasecmp(boolstr, "on", 2) || | |
484 | !g_ascii_strncasecmp(boolstr, "1", 1)) | |
485 | return TRUE; | |
486 | ||
487 | return FALSE; | |
488 | } | |
489 | ||
490 | /** @since 0.2.0 */ | |
491 | SR_API int sr_parse_period(const char *periodstr, uint64_t *p, uint64_t *q) | |
492 | { | |
493 | char *s; | |
494 | ||
495 | *p = strtoull(periodstr, &s, 10); | |
496 | if (*p == 0 && s == periodstr) | |
497 | /* No digits found. */ | |
498 | return SR_ERR_ARG; | |
499 | ||
500 | if (s && *s) { | |
501 | while (*s == ' ') | |
502 | s++; | |
503 | if (!strcmp(s, "fs")) | |
504 | *q = 1000000000000000ULL; | |
505 | else if (!strcmp(s, "ps")) | |
506 | *q = 1000000000000ULL; | |
507 | else if (!strcmp(s, "ns")) | |
508 | *q = 1000000000ULL; | |
509 | else if (!strcmp(s, "us")) | |
510 | *q = 1000000; | |
511 | else if (!strcmp(s, "ms")) | |
512 | *q = 1000; | |
513 | else if (!strcmp(s, "s")) | |
514 | *q = 1; | |
515 | else | |
516 | /* Must have a time suffix. */ | |
517 | return SR_ERR_ARG; | |
518 | } | |
519 | ||
520 | return SR_OK; | |
521 | } | |
522 | ||
523 | /** @since 0.2.0 */ | |
524 | SR_API int sr_parse_voltage(const char *voltstr, uint64_t *p, uint64_t *q) | |
525 | { | |
526 | char *s; | |
527 | ||
528 | *p = strtoull(voltstr, &s, 10); | |
529 | if (*p == 0 && s == voltstr) | |
530 | /* No digits found. */ | |
531 | return SR_ERR_ARG; | |
532 | ||
533 | if (s && *s) { | |
534 | while (*s == ' ') | |
535 | s++; | |
536 | if (!strcasecmp(s, "mv")) | |
537 | *q = 1000L; | |
538 | else if (!strcasecmp(s, "v")) | |
539 | *q = 1; | |
540 | else | |
541 | /* Must have a base suffix. */ | |
542 | return SR_ERR_ARG; | |
543 | } | |
544 | ||
545 | return SR_OK; | |
546 | } | |
547 | ||
548 | /** @} */ |