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https://github.com/minetest/minetest.git
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Add Settings::getStruct and Settings::setStruct
This commit is contained in:
kwolekr
Perttu Ahola
parent
cde3d38766
commit
45cf32afc5
266
src/settings.h
266
src/settings.h
@ -566,6 +566,270 @@ public:
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return value;
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}
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template<typename T> struct alignment_trick { char c; T member; };
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#define ALIGNOF(type) offsetof (alignment_trick<type>, member)
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#define PADDING(x, y) ((ALIGNOF(y) - ((uintptr_t)(x) & (ALIGNOF(y) - 1))) & (ALIGNOF(y) - 1))
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typedef int64_t s64;
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void *getStruct(std::string &name, std::string format, size_t len)
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{
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std::vector<std::string *> strs_alloced;
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std::string *str;
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char *s = &(get(name))[0];
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char *buf = new char[len];
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char *bufpos = buf;
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char *f, *snext;
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size_t pos;
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char *fmt = &format[0];
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while ((f = strsep(&fmt, ",")) && s) {
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bool is_unsigned = false;
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int width = 0;
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char valtype = *f;
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width = (int)strtol(f + 1, &f, 10);
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if (width && valtype == 's')
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valtype = 'i';
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switch (*f) {
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case 'u':
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is_unsigned = true;
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/* FALLTHROUGH */
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case 'i':
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if (width == 16) {
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bufpos += PADDING(bufpos, u16);
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if ((bufpos - buf) + sizeof(u16) <= len) {
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if (is_unsigned)
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*(u16 *)bufpos = (u16)strtoul(s, &s, 10);
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else
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*(s16 *)bufpos = (s16)strtol(s, &s, 10);
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}
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bufpos += sizeof(u16);
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} else if (width == 32) {
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bufpos += PADDING(bufpos, u32);
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if ((bufpos - buf) + sizeof(u32) <= len) {
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if (is_unsigned)
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*(u32 *)bufpos = (u32)strtoul(s, &s, 10);
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else
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*(s32 *)bufpos = (s32)strtol(s, &s, 10);
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}
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bufpos += sizeof(u32);
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} else if (width == 64) {
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bufpos += PADDING(bufpos, u64);
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if ((bufpos - buf) + sizeof(u64) <= len) {
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if (is_unsigned)
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*(u64 *)bufpos = (u64)strtoull(s, &s, 10);
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else
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*(s64 *)bufpos = (s64)strtoll(s, &s, 10);
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}
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bufpos += sizeof(u64);
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}
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s = strchr(s, ',');
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break;
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case 'b':
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snext = strchr(s, ',');
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if (snext)
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*snext++ = 0;
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bufpos += PADDING(bufpos, bool);
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if ((bufpos - buf) + sizeof(bool) <= len)
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*(bool *)bufpos = is_yes(std::string(s));
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bufpos += sizeof(bool);
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s = snext;
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break;
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case 'f':
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bufpos += PADDING(bufpos, float);
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if ((bufpos - buf) + sizeof(float) <= len)
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*(float *)bufpos = strtof(s, &s);
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bufpos += sizeof(float);
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s = strchr(s, ',');
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break;
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case 's':
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while (*s == ' ' || *s == '\t')
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s++;
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if (*s++ != '"') //error, expected string
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goto fail;
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snext = s;
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while (snext[0] && !(snext[-1] != '\\' && snext[0] == '"'))
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snext++;
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*snext++ = 0;
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bufpos += PADDING(bufpos, std::string *);
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str = new std::string(s);
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pos = 0;
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while ((pos = str->find("\\\"", pos)) != std::string::npos)
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str->erase(pos, 1);
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if ((bufpos - buf) + sizeof(std::string *) <= len)
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*(std::string **)bufpos = str;
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bufpos += sizeof(std::string *);
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strs_alloced.push_back(str);
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s = *snext ? snext + 1 : NULL;
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break;
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case 'v':
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while (*s == ' ' || *s == '\t')
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s++;
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if (*s++ != '(') //error, expected vector
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goto fail;
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if (width == 2) {
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bufpos += PADDING(bufpos, v2f);
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if ((bufpos - buf) + sizeof(v2f) <= len) {
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v2f *v = (v2f *)bufpos;
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v->X = strtof(s, &s);
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s++;
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v->Y = strtof(s, &s);
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}
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bufpos += sizeof(v2f);
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} else if (width == 3) {
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bufpos += PADDING(bufpos, v3f);
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if ((bufpos - buf) + sizeof(v3f) <= len) {
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v3f *v = (v3f *)bufpos;
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v->X = strtof(s, &s);
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s++;
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v->Y = strtof(s, &s);
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s++;
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v->Z = strtof(s, &s);
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}
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bufpos += sizeof(v3f);
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}
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s = strchr(s, ',');
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break;
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default: //error, invalid format specifier
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goto fail;
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}
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if (s && *s == ',')
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s++;
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if ((bufpos - buf) > len) //error, buffer too small
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goto fail;
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}
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if (f && *f) { //error, mismatched number of fields and values
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fail:
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for (int i = 0; i != strs_alloced.size(); i++)
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delete strs_alloced[i];
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delete[] buf;
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buf = NULL;
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}
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return buf;
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}
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bool setStruct(std::string name, std::string format, void *value)
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{
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char sbuf[2048];
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int sbuflen = sizeof(sbuf) - 1;
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sbuf[sbuflen] = 0;
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std::string str;
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int pos = 0;
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size_t fpos;
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char *f;
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int nprinted;
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char *bufpos = (char *)value;
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char *fmt = &format[0];
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while ((f = strsep(&fmt, ","))) {
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bool is_unsigned = false;
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int width = 0;
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char valtype = *f;
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width = (int)strtol(f + 1, &f, 10);
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if (width && valtype == 's')
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valtype = 'i';
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switch (valtype) {
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case 'u':
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is_unsigned = true;
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/* FALLTHROUGH */
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case 'i':
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if (width == 16) {
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bufpos += PADDING(bufpos, u16);
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nprinted = snprintf(sbuf + pos, sbuflen,
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is_unsigned ? "%u, " : "%d, ",
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*((u16 *)bufpos));
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bufpos += sizeof(u16);
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} else if (width == 32) {
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bufpos += PADDING(bufpos, u32);
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nprinted = snprintf(sbuf + pos, sbuflen,
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is_unsigned ? "%u, " : "%d, ",
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*((u32 *)bufpos));
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bufpos += sizeof(u32);
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} else if (width == 64) {
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bufpos += PADDING(bufpos, u64);
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nprinted = snprintf(sbuf + pos, sbuflen,
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is_unsigned ? "%llu, " : "%lli, ",
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*((u64 *)bufpos));
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bufpos += sizeof(u64);
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}
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break;
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case 'b':
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bufpos += PADDING(bufpos, bool);
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nprinted = snprintf(sbuf + pos, sbuflen, "%s, ",
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*((bool *)bufpos) ? "true" : "false");
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bufpos += sizeof(bool);
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break;
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case 'f':
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bufpos += PADDING(bufpos, float);
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nprinted = snprintf(sbuf + pos, sbuflen, "%f, ",
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*((float *)bufpos));
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bufpos += sizeof(float);
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break;
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case 's':
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bufpos += PADDING(bufpos, std::string *);
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str = **((std::string **)bufpos);
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fpos = 0;
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while ((fpos = str.find('"', fpos)) != std::string::npos) {
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str.insert(fpos, 1, '\\');
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fpos += 2;
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}
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nprinted = snprintf(sbuf + pos, sbuflen, "\"%s\", ",
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(*((std::string **)bufpos))->c_str());
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bufpos += sizeof(std::string *);
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break;
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case 'v':
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if (width == 2) {
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bufpos += PADDING(bufpos, v2f);
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v2f *v = (v2f *)bufpos;
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nprinted = snprintf(sbuf + pos, sbuflen,
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"(%f, %f), ", v->X, v->Y);
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bufpos += sizeof(v2f);
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} else {
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bufpos += PADDING(bufpos, v3f);
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v3f *v = (v3f *)bufpos;
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nprinted = snprintf(sbuf + pos, sbuflen,
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"(%f, %f, %f), ", v->X, v->Y, v->Z);
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bufpos += sizeof(v3f);
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}
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break;
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default:
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return false;
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}
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if (nprinted < 0) //error, buffer too small
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return false;
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pos += nprinted;
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sbuflen -= nprinted;
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}
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if (pos >= 2)
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sbuf[pos - 2] = 0;
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set(name, std::string(sbuf));
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return true;
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}
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void setBool(std::string name, bool value)
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{
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if(value)
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@ -574,8 +838,6 @@ public:
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set(name, "false");
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}
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void setFloat(std::string name, float value)
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{
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set(name, ftos(value));
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