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1 | /* |
2 | * This file is part of the sigrok 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 <sigrok.h> | |
25 | ||
26 | /** | |
27 | * Convert a numeric samplerate value to its "natural" string representation. | |
28 | * | |
29 | * E.g. a value of 3000000 would be converted to "3 MHz", 20000 to "20 KHz". | |
30 | * | |
31 | * @param samplerate The samplerate in Hz. | |
32 | * @return A malloc()ed string representation of the samplerate value, | |
33 | * or NULL upon errors. The caller is responsible to free() the memory. | |
34 | */ | |
35 | char *sigrok_samplerate_string(uint64_t samplerate) | |
36 | { | |
37 | char *o; | |
38 | int r; | |
39 | ||
40 | o = malloc(30 + 1); /* Enough for a uint64_t as string + " GHz". */ | |
41 | if (o == NULL) | |
42 | return NULL; | |
43 | ||
44 | if (samplerate >= GHZ(1)) | |
45 | r = snprintf(o, 30, "%"PRIu64" GHz", samplerate / 1000000000); | |
46 | else if (samplerate >= MHZ(1)) | |
47 | r = snprintf(o, 30, "%"PRIu64" MHz", samplerate / 1000000); | |
48 | else if (samplerate >= KHZ(1)) | |
49 | r = snprintf(o, 30, "%"PRIu64" KHz", samplerate / 1000); | |
50 | else | |
51 | r = snprintf(o, 30, "%"PRIu64" Hz", samplerate); | |
52 | ||
53 | if (r < 0) { | |
54 | /* Something went wrong... */ | |
55 | free(o); | |
56 | return NULL; | |
57 | } | |
58 | ||
59 | return o; | |
60 | } |