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include "tunits.h"
#* HISTORY *
#* B.Simon 07-Jan-99 Original
# ABREV_UNSTR -- Replace units string with its abbreviation
procedure abrev_unstr (ab, instr, outstr, maxch)
pointer ab # i: abbreviation hash descriptor
char instr[ARB] # i: string to be abbreviated
char outstr[ARB] # o: abbreviated string
int maxch # i: max length of abbreviated string
#--
int nc
pointer sp, temp
int gstrcpy(), find_abrev ()
begin
if (find_abrev (ab, instr, outstr, maxch) == YES)
return
call smark (sp)
call salloc (temp, LEN_UNIT, TY_CHAR)
nc = gstrcpy (instr, Memc[temp], LEN_UNIT)
if (nc == 1 || instr[nc] != 's') {
call strcpy (instr, outstr, maxch)
} else {
Memc[temp+nc-1] = EOS
if (find_abrev (ab, Memc[temp], outstr, maxch) == NO)
call strcpy (Memc[temp], outstr, maxch)
}
call sfree (sp)
end
# COPY_UNSTR -- Copy a units descriptor
pointer procedure copy_unstr (punit1)
pointer punit1 # i: units descriptor to be copied
#--
int idx
pointer punit2
begin
# Allocate structure to hold units
call calloc (punit2, LEN_TUNSTRUCT, TY_INT)
# Copy numeric factor
TUN_FACTOR(punit2) = TUN_FACTOR(punit1)
# Copy units and their powers
do idx = 1, MAXUNIT {
if (TUN_UNPTR(punit1,idx) == NULL)
break
call malloc (TUN_UNPTR(punit2,idx), LEN_UNIT, TY_CHAR)
call strcpy (TUN_UNITS(punit1,idx), TUN_UNITS(punit2,idx),
LEN_UNIT)
TUN_POWER(punit2,idx) = TUN_POWER(punit1,idx)
}
return (punit2)
end
# DIV_UNSTR -- Divide one set of units by another
pointer procedure div_unstr (punit1, punit2)
pointer punit1 # i: descriptor for first set of units
pointer punit2 # i: descriptor for second set of units
#--
int idx, jdx, kdx, power
pointer punit3
int find_unstr()
begin
# Allocate structure to hold units
call calloc (punit3, LEN_TUNSTRUCT, TY_INT)
# Compute the new factor
TUN_FACTOR(punit3) = TUN_FACTOR(punit1) / TUN_FACTOR(punit2)
# Find units in both descriptors and subtract their powers
jdx = 1
do idx = 1, MAXUNIT {
if (TUN_UNPTR(punit1,idx) == NULL)
break
kdx = find_unstr (punit2, TUN_UNITS(punit1, idx))
if (kdx == 0)
next
power = TUN_POWER(punit1,idx) - TUN_POWER(punit2,kdx)
if (power == 0)
next
call malloc (TUN_UNPTR(punit3,jdx), LEN_UNIT, TY_CHAR)
call strcpy (TUN_UNITS(punit1,idx), TUN_UNITS(punit3,jdx),
LEN_UNIT)
TUN_POWER(punit3,jdx) = power
jdx = jdx + 1
}
# Find units only in a single descriptor and add them to the
# new descriptor
do idx = 1, MAXUNIT {
if (TUN_UNPTR(punit1,idx) == NULL)
break
if (find_unstr (punit2, TUN_UNITS(punit1, idx)) == 0) {
call malloc (TUN_UNPTR(punit3,jdx), LEN_UNIT, TY_CHAR)
call strcpy (TUN_UNITS(punit1,idx), TUN_UNITS(punit3,jdx),
LEN_UNIT)
TUN_POWER(punit3,jdx) = TUN_POWER(punit1,idx)
jdx = jdx + 1
}
}
do idx = 1, MAXUNIT {
if (TUN_UNPTR(punit2,idx) == NULL)
break
if (find_unstr (punit1, TUN_UNITS(punit2, idx)) == 0) {
call malloc (TUN_UNPTR(punit3,jdx), LEN_UNIT, TY_CHAR)
call strcpy (TUN_UNITS(punit2,idx), TUN_UNITS(punit3,jdx),
LEN_UNIT)
TUN_POWER(punit3,jdx) = - TUN_POWER(punit2,idx)
jdx = jdx + 1
}
}
return (punit3)
end
# FIND_UNSTR -- Find location of units string in descriptor
int procedure find_unstr (punit, units)
pointer punit # i: units descriptor
char units[ARB] # i: units string to search for
#--
int idx
bool streq()
begin
do idx = 1, MAXUNIT {
if (TUN_UNPTR(punit,idx) == NULL)
break
if (streq (TUN_UNITS(punit,idx), units))
return (idx)
}
return (0)
end
# FREE_UNSTR -- Release memory used by a units descriptor
procedure free_unstr (punit)
pointer punit # i: units descriptor
#--
int idx
begin
do idx = 1, MAXUNIT {
if (TUN_UNPTR(punit,idx) == NULL)
break
call mfree (TUN_UNPTR(punit,idx), TY_CHAR)
}
call mfree (punit, TY_INT)
end
# MUL_UNSTR -- Multiply two sets of units together
pointer procedure mul_unstr (punit1, punit2)
pointer punit1 # i: descriptor for first set of units
pointer punit2 # i: descriptor for second set of units
#--
int idx, jdx, kdx, power
pointer punit3
int find_unstr()
begin
# Allocate structure to hold units
call calloc (punit3, LEN_TUNSTRUCT, TY_INT)
# Compute the new factor
TUN_FACTOR(punit3) = TUN_FACTOR(punit1) * TUN_FACTOR(punit2)
# Find units in both descriptors and add their powers
jdx = 1
do idx = 1, MAXUNIT {
if (TUN_UNPTR(punit1,idx) == NULL)
break
kdx = find_unstr (punit2, TUN_UNITS(punit1, idx))
if (kdx == 0)
next
power = TUN_POWER(punit1,idx) + TUN_POWER(punit2,kdx)
if (power == 0)
next
call malloc (TUN_UNPTR(punit3,jdx), LEN_UNIT, TY_CHAR)
call strcpy (TUN_UNITS(punit1,idx), TUN_UNITS(punit3,jdx),
LEN_UNIT)
TUN_POWER(punit3,jdx) = power
jdx = jdx + 1
}
# Find units only in a single descriptor and add them to the
# new descriptor
do idx = 1, MAXUNIT {
if (TUN_UNPTR(punit1,idx) == NULL)
break
if (find_unstr (punit2, TUN_UNITS(punit1, idx)) == 0) {
call malloc (TUN_UNPTR(punit3,jdx), LEN_UNIT, TY_CHAR)
call strcpy (TUN_UNITS(punit1,idx), TUN_UNITS(punit3,jdx),
LEN_UNIT)
TUN_POWER(punit3,jdx) = TUN_POWER(punit1,idx)
jdx = jdx + 1
}
}
do idx = 1, MAXUNIT {
if (TUN_UNPTR(punit2,idx) == NULL)
break
if (find_unstr (punit1, TUN_UNITS(punit2, idx)) == 0) {
call malloc (TUN_UNPTR(punit3,jdx), LEN_UNIT, TY_CHAR)
call strcpy (TUN_UNITS(punit2,idx), TUN_UNITS(punit3,jdx),
LEN_UNIT)
TUN_POWER(punit3,jdx) = TUN_POWER(punit2,idx)
jdx = jdx + 1
}
}
return (punit3)
end
# NUM_UNSTR -- Convert a token to an integer
int procedure num_unstr (value)
char value[ARB] # i: string containing token value
#--
int ic, nc, num
int ctoi()
begin
ic = 1
nc = ctoi (value, ic, num)
return (num)
end
# POW_UNSTR -- Raise a set of units to an integer power
pointer procedure pow_unstr (punit1, power)
pointer punit1 # i: units descriptor to be raised to power
int power
#--
int idx
pointer punit2
begin
# Allocate structure to hold units
call calloc (punit2, LEN_TUNSTRUCT, TY_INT)
# Compute the new factor
TUN_FACTOR(punit2) = TUN_FACTOR(punit1) ** power
# Find units in both descriptors and add their powers
if (power != 0) {
for (idx = 1; idx <= MAXUNIT; idx = idx + 1) {
if (TUN_UNPTR(punit1,idx) == NULL)
break
call malloc (TUN_UNPTR(punit2,idx), LEN_UNIT, TY_CHAR)
call strcpy (TUN_UNITS(punit1,idx), TUN_UNITS(punit2,idx),
LEN_UNIT)
TUN_POWER(punit2,idx) = TUN_POWER(punit1,idx) * power
}
}
return (punit2)
end
# SET_UNSTR -- Make a new units description from a units string and its power
pointer procedure set_unstr (ab, units, power)
pointer ab # i: hash of units abbreviations
char units[ARB] # i: units string
int power # i: power of the units
#--
pointer punit
begin
# Allocate structure to hold units
call calloc (punit, LEN_TUNSTRUCT, TY_INT)
call malloc (TUN_UNPTR(punit,1), LEN_UNIT, TY_CHAR)
# Set the first slot in the structure to hold the string
# and power passed to this procedure
TUN_FACTOR(punit) = 1.0
TUN_POWER(punit,1) = power
call abrev_unstr (ab, units, TUN_UNITS(punit,1), LEN_UNIT)
return (punit)
end
# STR_UNSTR -- Convert units structure into a string
procedure str_unstr (punit, str, maxch)
pointer punit # i: units descriptor
char str[ARB] # o: string representation of units
int maxch # i: max length of string
#--
int ic, idx
int strlen(), gstrcpy(), itoc()
begin
call sprintf (str, maxch, "%g")
call pargd (TUN_FACTOR(punit))
ic = strlen (str) + 1
do idx = 1, MAXUNIT {
if (TUN_UNPTR(punit,idx) == NULL)
break
ic = ic + gstrcpy ("*", str[ic], maxch-ic+1)
ic = ic + gstrcpy (TUN_UNITS(punit,idx), str[ic], maxch+ic-1)
if (TUN_POWER(punit,idx) != 1) {
ic = ic + gstrcpy ("^", str[ic], maxch-ic+1)
ic = ic + itoc (TUN_POWER(punit,idx), str[ic], maxch-ic+1)
}
}
end
|
