From: Linus Torvalds Date: Tue, 30 Aug 2011 20:48:05 +0000 (-0700) Subject: Fill in dummy parse target code X-Git-Url: http://git.tdb.fi/?a=commitdiff_plain;h=ee35716ec72e258897f69e5a22400bc52c51716d;p=ext%2Fsubsurface.git Fill in dummy parse target code .. but don't actually parse anything yet. But hey - now it tells you how many samples it (hasn't) parsed. Signed-off-by: Linus Torvalds --- diff --git a/parse.c b/parse.c index 2321f7d..7595ef5 100644 --- a/parse.c +++ b/parse.c @@ -4,6 +4,128 @@ #include #include +/* + * Some silly typedefs to make our units very explicit. + * + * Also, the units are chosen so that values can be expressible as + * integers, so that we never have FP rounding issues. And they + * are small enough that converting to/from imperial units doesn't + * really matter. + * + * We also strive to make '0' a meaningless number saying "not + * initialized", since many values are things that may not have + * been reported (eg tank pressure or temperature from dive + * computers that don't support them). But sometimes -1 is an even + * more explicit way of saying "not there". + * + * Thus "millibar" for pressure, for example, or "millikelvin" for + * temperatures. Doing temperatures in celsius or fahrenheit would + * make for loss of precision when converting from one to the other, + * and using millikelvin is SI-like but also means that a temperature + * of '0' is clearly just a missing temperature or tank pressure. + * + * Also strive to use units that can not possibly be mistaken for a + * valid value in a "normal" system without conversion. If the max + * depth of a dive is '20000', you probably didn't convert from mm on + * output, or if the max depth gets reported as "0.2ft" it was either + * a really boring dive, or there was some missing input conversion, + * and a 60-ft dive got recorded as 60mm. + * + * Doing these as "structs containing value" means that we always + * have to explicitly write out those units in order to get at the + * actual value. So there is hopefully little fear of using a value + * in millikelvin as Fahrenheit by mistake. + * + * We don't actually use these all yet, so maybe they'll change, but + * I made a number of types as guidelines. + */ +typedef struct { + int seconds; +} duration_t; + +typedef struct { + int mm; +} depth_t; + +typedef struct { + int mbar; +} pressure_t; + +typedef struct { + int mkelvin; +} temperature_t; + +typedef struct { + int mliter; +} volume_t; + +typedef struct { + int permille; +} fraction_t; + +typedef struct { + int grams; +} weight_t; + +typedef struct { + fraction_t o2; + fraction_t n2; + fraction_t he2; +} gasmix_t; + +typedef struct { + volume_t size; + pressure_t pressure; +} tank_type_t; + +struct sample { + duration_t time; + depth_t depth; + temperature_t temperature; + pressure_t tankpressure; + int tankindex; +}; + +struct dive { + time_t when; + depth_t maxdepth, meandepth; + duration_t duration, surfacetime; + depth_t visibility; + temperature_t airtemp, watertemp; + pressure_t beginning_pressure, end_pressure; + int samples; + struct sample sample[]; +}; + +static void record_dive(struct dive *dive) +{ + static int nr; + + printf("Recording dive %d with %d samples\n", ++nr, dive->samples); +} + +/* We're in samples - try to convert the random xml value to something useful */ +static void try_to_fill_sample(struct sample *sample, const char *name, int size, const char *buffer) +{ +} + +/* We're in the top-level dive xml. Try to convert whatever value to a dive value */ +static void try_to_fill_dive(struct dive *dive, const char *name, int size, const char *buffer) +{ +} + +/* + * Dive info as it is being built up.. + */ +static int alloc_samples; +static struct dive *dive; +static struct sample *sample; + +static unsigned int dive_size(int samples) +{ + return sizeof(struct dive) + samples*sizeof(struct sample); +} + /* * File boundaries are dive boundaries. But sometimes there are * multiple dives per file, so there can be other events too that @@ -12,25 +134,61 @@ */ static void dive_start(void) { - printf("---\n"); + unsigned int size; + + alloc_samples = 5; + size = dive_size(alloc_samples); + dive = malloc(size); + if (!dive) + exit(1); + memset(dive, 0, size); } static void dive_end(void) { + if (!dive) + return; + record_dive(dive); + dive = NULL; } static void sample_start(void) { - printf("Sample:\n"); + int nr; + + if (!dive) + return; + nr = dive->samples; + if (nr >= alloc_samples) { + unsigned int size; + + alloc_samples = (alloc_samples * 3)/2 + 10; + size = dive_size(alloc_samples); + dive = realloc(dive, size); + if (!dive) + return; + } + sample = dive->samples + nr; } static void sample_end(void) { + sample = NULL; + if (!dive) + return; + dive->samples++; } static void entry(const char *name, int size, const char *buffer) { - printf("%s: %.*s\n", name, size, buffer); + if (sample) { + try_to_fill_sample(sample, name, size, buffer); + return; + } + if (dive) { + try_to_fill_dive(dive, name, size, buffer); + return; + } } static const char *nodename(xmlNode *node, char *buf, int len)