static const char *
lookupunit(const char *unit)
{
int i;
char *copy;
for (i = 0; i < unitcount; i++) {
if (!strcmp(unittable[i].uname, unit))
return unittable[i].uval;
}
if (unit[strlen(unit) - 1] == '^') {
copy = dupstr(unit);
copy[strlen(copy) - 1] = 0;
for (i = 0; i < unitcount; i++) {
if (!strcmp(unittable[i].uname, copy)) {
strlcpy(buffer, copy, sizeof(buffer));
free(copy);
return buffer;
}
}
free(copy);
}
if (unit[strlen(unit) - 1] == 's') {
copy = dupstr(unit);
copy[strlen(copy) - 1] = 0;
for (i = 0; i < unitcount; i++) {
if (!strcmp(unittable[i].uname, copy)) {
strlcpy(buffer, copy, sizeof(buffer));
free(copy);
return buffer;
}
}
if (copy[strlen(copy) - 1] == 'e') {
copy[strlen(copy) - 1] = 0;
for (i = 0; i < unitcount; i++) {
if (!strcmp(unittable[i].uname, copy)) {
strlcpy(buffer, copy, sizeof(buffer));
free(copy);
return buffer;
}
}
}
free(copy);
}
for (i = 0; i < prefixcount; i++) {
if (!strncmp(prefixtable[i].prefixname, unit,
strlen(prefixtable[i].prefixname))) {
unit += strlen(prefixtable[i].prefixname);
if (!strlen(unit) || lookupunit(unit)) {
strlcpy(buffer, prefixtable[i].prefixval,
sizeof(buffer));
strlcat(buffer, " ", sizeof(buffer));
strlcat(buffer, unit, sizeof(buffer));
return buffer;
}
}
}
return 0;
}
int
reduceproduct(struct unittype *theunit, int flip)
{
char *toadd, **product;
int didsomething = 2;
if (flip)
product = theunit->denominator;
else
product = theunit->numerator;
for (; *product; product++) {
for (;;) {
if (!strlen(*product))
break;
toadd = lookupunit(*product);
if (!toadd) {
printf("unknown unit '%s'\n", *product);
return ERROR;
}
if (strchr(toadd, PRIMITIVECHAR))
break;
didsomething = 1;
if (*product != NULLUNIT) {
free(*product);
*product = NULLUNIT;
}
if (addunit(theunit, toadd, flip))
return ERROR;
}
}
return didsomething;
}
char *
lookupunit(const char *unit)
{
int i;
char *copy;
for (i = 0; i < unitcount; i++) {
if (!strcmp(unittable[i].uname, unit))
return unittable[i].uval;
}
if (unit[strlen(unit) - 1] == '^') {
copy = dupstr(unit);
copy[strlen(copy) - 1] = 0;
for (i = 0; i < unitcount; i++) {
if (!strcmp(unittable[i].uname, copy)) {
strlcpy(buffer, copy, sizeof(buffer));
free(copy);
return buffer;
}
}
free(copy);
}
if (unit[strlen(unit) - 1] == 's') {
copy = dupstr(unit);
copy[strlen(copy) - 1] = 0;
for (i = 0; i < unitcount; i++) {
if (!strcmp(unittable[i].uname, copy)) {
strlcpy(buffer, copy, sizeof(buffer));
free(copy);
return buffer;
}
}
if (copy[strlen(copy) - 1] == 'e') {
copy[strlen(copy) - 1] = 0;
for (i = 0; i < unitcount; i++) {
if (!strcmp(unittable[i].uname, copy)) {
strlcpy(buffer, copy, sizeof(buffer));
free(copy);
return buffer;
}
}
}
free(copy);
}
for (i = 0; i < prefixcount; i++) {
size_t len = strlen(prefixtable[i].prefixname);
if (!strncmp(prefixtable[i].prefixname, unit, len)) {
if (!strlen(unit + len) || lookupunit(unit + len)) {
snprintf(buffer, sizeof(buffer), "%s %s",
prefixtable[i].prefixval, unit + len);
return buffer;
}
}
}
return 0;
}
