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gtools.c
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gtools.c
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/* gtools.c : Common routines for gtools programs. */
/* Version 4.2, Oct 2017. */
/* Todo: size check if MAXN>0; option to free memory */
#include "gtools.h"
#ifndef SEEK_SET
#define SEEK_SET 0
#define SEEK_CUR 1
#define SEEK_END 2
#endif
TLS_ATTR size_t ogf_linelen;
TLS_ATTR boolean is_pipe;
#if HAVE_FSEEKO
#define FSEEK_VER fseeko
#define FTELL_VER ftello
#define OFF_T_VER off_t
#else
#if !FTELL_DEC
extern long ftell(FILE*);
extern int fseek(FILE*,long,int);
#endif
#define FSEEK_VER fseek
#define FTELL_VER ftell
#define OFF_T_VER long
#endif
#if !POPEN_DEC
extern FILE *popen(const char*,const char*);
#endif
/*
Version 1.1: Fixed sparse6 input for powers of 2. May 9, 1998
Version 1.2: Added "cmd: ..." option for opengraphfile().
Fixed readg() bug (could not be invisible). Oct 5, 1998
Version 1.3: Added "is_pipe". June 20, 2002
Version 1.4: Stuff for autoconf. August 30, 2002
Version 1.5: Unlocked stdio for efficiency. October 31, 2004
Also fwrite() in place of fputs() for writeline().
Version 1.6: i/o for sparsegraph; use of s6len; improve allocations
Version 1.7: Add stringcounts()
Add very long size code (see formats.txt)
Version 1.8: Add gtools_check()
Version 1.9: Add writepc_sg(), readpc_sg() and readpcle_sg()
Add planar_code options to opengraphfile()
Version 2.4: Add writeec_sg(), readec_sg() (MISSING!)
Add edge_code options to opengraphfile()
Version 2.5: Remove sortints(), not used
Version 2.6: Add sgtog6() and writeg6_sg()
Version 2.7: Add lots of explicit casts.
Fix planar code output for n > 255.
Version 3.0: Procedures for incremental sparse6 format.
Add checkgline()
Version 4.0: Procedures for digraph6 format.
Version 4.1: Made encodegraphsize() external.
Version 4.2: Fixes for null graphs; thanks to Kevin Ryde.
*/
#define B(i) (1 << ((i)-1))
#define M(i) ((1 << (i))-1)
/*********************************************************************
opengraphfile(filename,codetype,assumefixed,position)
opens and positions a file for reading graphs.
filename = the name of the file to open
(NULL means stdin, assumed already open)
If filename starts with "cmd:", the remainder is taken
to be a command to open a subshell for, using a pipe.
codetype = returns a code for the format.
This is a combination of SPARSE6, GRAPH6, PLANARCODE,
PLANARCODELE, PLANARCODEBE, EDGECODE, DIGRAPH6,
UNKNOWN_TYPE and HAS_HEADER.
If a header is present, that overrides the data.
If there is no header, the first graph is examined.
assumefixed = nonzero if files other than stdin or pipes should be
assumed to be seekable and have equal record sizes.
Ignored if there is a sparse6 header or the first
graph has sparse6 format.
position = the number of the record to position to
(the first is number 1; 0 and -NOLIMIT also mean
to position at start). planar_code files can only
be positioned at the start.
If the file starts with ">", there must be a header.
Otherwise opengraphfile() fails.
The value returned is a file pointer or NULL.
If assumedfixed is not zero and position > 1, the global variable
ogf_linelen is set to the length (including \n) of the length of the
first record. UPDATE
The global variable is_pipe is set to whether the input file is a pipe.
**********************************************************************/
FILE*
opengraphfile(char *filename, int *codetype, int assumefixed, long position)
{
FILE *f;
int c,bl,firstc;
long i,l;
OFF_T_VER pos,pos1,pos2;
boolean bad_header;
is_pipe = FALSE;
if (filename == NULL)
{
f = stdin;
assumefixed = FALSE;
}
else
{
if (filename[0] == 'c' && filename[1] == 'm'
&& filename[2] == 'd' && filename[3] == ':')
{
#if !HAVE_POPEN
gt_abort
(">E The \"cmd:\" option is not available in this version.\n");
#else
filename += 4;
while (*filename == ' ') ++filename;
f = popen(filename,"r");
#endif
assumefixed = FALSE;
is_pipe = TRUE;
}
else
f = fopen(filename,"r");
if (f == NULL)
{
fprintf(stderr,">E opengraphfile: can't open %s\n",filename);
return NULL;
}
}
FLOCKFILE(f);
firstc = c = GETC(f);
if (c == EOF)
{
*codetype = GRAPH6;
FUNLOCKFILE(f);
return f;
}
if (c != '>')
{
*codetype = firstc == ':' ? SPARSE6 : firstc == '&' ? DIGRAPH6 : GRAPH6;
ungetc(c,f);
}
else
{
bad_header = FALSE;
if ((c = GETC(f)) == EOF || c != '>')
bad_header = TRUE;
if (!bad_header && ((c = GETC(f)) == EOF ||
(c != 'g' && c != 's' && c != 'p' && c != 'd' && c != 'e')))
bad_header = TRUE;
if (!bad_header && c == 'g')
{
if ((c = GETC(f)) == EOF || c != 'r' ||
(c = GETC(f)) == EOF || c != 'a' ||
(c = GETC(f)) == EOF || c != 'p' ||
(c = GETC(f)) == EOF || c != 'h' ||
(c = GETC(f)) == EOF || c != '6' ||
(c = GETC(f)) == EOF || c != '<' ||
(c = GETC(f)) == EOF || c != '<')
bad_header = TRUE;
else
*codetype = GRAPH6 | HAS_HEADER;
}
else if (!bad_header && c == 'd')
{
if ((c = GETC(f)) == EOF || c != 'i' ||
(c = GETC(f)) == EOF || c != 'g' ||
(c = GETC(f)) == EOF || c != 'r' ||
(c = GETC(f)) == EOF || c != 'a' ||
(c = GETC(f)) == EOF || c != 'p' ||
(c = GETC(f)) == EOF || c != 'h' ||
(c = GETC(f)) == EOF || c != '6' ||
(c = GETC(f)) == EOF || c != '<' ||
(c = GETC(f)) == EOF || c != '<')
bad_header = TRUE;
else
*codetype = DIGRAPH6 | HAS_HEADER;
}
else if (!bad_header && c == 'e')
{
if ((c = GETC(f)) == EOF || c != 'd' ||
(c = GETC(f)) == EOF || c != 'g' ||
(c = GETC(f)) == EOF || c != 'e' ||
(c = GETC(f)) == EOF || c != '_' ||
(c = GETC(f)) == EOF || c != 'c' ||
(c = GETC(f)) == EOF || c != 'o' ||
(c = GETC(f)) == EOF || c != 'd' ||
(c = GETC(f)) == EOF || c != 'e' ||
(c = GETC(f)) == EOF || c != '<' ||
(c = GETC(f)) == EOF || c != '<')
bad_header = TRUE;
else
*codetype = EDGECODE | HAS_HEADER;
}
else if (!bad_header && c == 's')
{
if ((c = GETC(f)) == EOF || c != 'p' ||
(c = GETC(f)) == EOF || c != 'a' ||
(c = GETC(f)) == EOF || c != 'r' ||
(c = GETC(f)) == EOF || c != 's' ||
(c = GETC(f)) == EOF || c != 'e' ||
(c = GETC(f)) == EOF || c != '6' ||
(c = GETC(f)) == EOF || c != '<' ||
(c = GETC(f)) == EOF || c != '<')
bad_header = TRUE;
else
*codetype = SPARSE6 | HAS_HEADER;
}
else if (!bad_header && c == 'p')
{
if ((c = GETC(f)) == EOF || c != 'l' ||
(c = GETC(f)) == EOF || c != 'a' ||
(c = GETC(f)) == EOF || c != 'n' ||
(c = GETC(f)) == EOF || c != 'a' ||
(c = GETC(f)) == EOF || c != 'r' ||
(c = GETC(f)) == EOF || c != '_' ||
(c = GETC(f)) == EOF || c != 'c' ||
(c = GETC(f)) == EOF || c != 'o' ||
(c = GETC(f)) == EOF || c != 'd' ||
(c = GETC(f)) == EOF || c != 'e')
bad_header = TRUE;
else
{
if ((c = GETC(f)) == EOF)
bad_header = TRUE;
else if (c == ' ')
{
if ((bl = GETC(f)) == EOF || (bl != 'l' && bl != 'b') ||
(c = GETC(f)) == EOF || c != 'e' ||
(c = GETC(f)) == EOF || c != '<' ||
(c = GETC(f)) == EOF || c != '<')
bad_header = TRUE;
else if (bl == 'l')
*codetype = PLANARCODELE | HAS_HEADER;
else
*codetype = PLANARCODEBE | HAS_HEADER;
}
else if (c == '<')
{
if ((c = GETC(f)) == EOF || c != '<')
bad_header = TRUE;
else
*codetype = PLANARCODE | HAS_HEADER;
}
else
bad_header = TRUE;
}
}
if (bad_header)
{
fprintf(stderr,">E opengraphfile: illegal header in %s\n",
filename == NULL ? "stdin" : filename);
*codetype = UNKNOWN_TYPE | HAS_HEADER;
FUNLOCKFILE(f);
return NULL;
}
}
if (position <= 1) return f;
if (*codetype&PLANARCODEANY)
{
fprintf(stderr,
">E opengraphfile: planar_code files can only be opened at the start\n");
*codetype = UNKNOWN_TYPE | HAS_HEADER;
FUNLOCKFILE(f);
fclose(f);
return NULL;
}
if (*codetype&EDGECODE)
{
fprintf(stderr,
">E opengraphfile: edge_code files can only be opened at the start\n");
*codetype = UNKNOWN_TYPE | HAS_HEADER;
FUNLOCKFILE(f);
fclose(f);
return NULL;
}
if (!assumefixed || (*codetype&SPARSE6) || firstc == ':')
{
l = 1;
while ((c = GETC(f)) != EOF)
{
if (c == '\n')
{
++l;
if (l == position) break;
}
}
if (l == position) return f;
fprintf(stderr,
">E opengraphfile: can't find line %ld in %s\n",position,
filename == NULL ? "stdin" : filename);
return NULL;
}
else
{
pos1 = FTELL_VER(f);
if (pos1 < 0)
{
fprintf(stderr,">E opengraphfile: error on first ftell\n");
return NULL;
}
for (i = 1; (c = GETC(f)) != EOF && c != '\n'; ++i) {}
ogf_linelen = i;
if (c == EOF)
{
fprintf(stderr,
">E opengraphfile: required record no present\n");
FUNLOCKFILE(f);
return NULL;
}
pos2 = FTELL_VER(f);
if (pos2 < 0)
{
fprintf(stderr,">E opengraphfile: error on second ftell\n");
return NULL;
}
pos = pos1 + (position-1)*(pos2-pos1);
if (FSEEK_VER(f,pos,SEEK_SET) < 0)
{
fprintf(stderr,">E opengraphfile: seek failed\n");
return NULL;
}
}
FUNLOCKFILE(f);
return f;
}
/*********************************************************************/
void
writeline(FILE *f, char *s)
/* write a line with error checking */
/* \n is not appended automatically */
{
size_t slen;
slen = strlen(s);
if (fwrite(s,1,slen,f) != slen || ferror(f))
gt_abort(">E writeline : error on writing\n");
}
/*********************************************************************/
/* This function used to be called getline(), but this was changed due
to too much confusion with the GNU function of that name.
*/
char*
gtools_getline(FILE *f) /* read a line with error checking */
/* includes \n (if present) and \0. Immediate EOF causes NULL return. */
{
DYNALLSTAT(char,s,s_sz);
int c;
long i;
DYNALLOC1(char,s,s_sz,5000,"gtools_getline");
FLOCKFILE(f);
i = 0;
while ((c = GETC(f)) != EOF && c != '\n')
{
if (i == s_sz-3)
DYNREALLOC(char,s,s_sz,3*(s_sz/2)+10000,"gtools_getline");
s[i++] = (char)c;
}
FUNLOCKFILE(f);
if (i == 0 && c == EOF) return NULL;
if (c == '\n') s[i++] = '\n';
s[i] = '\0';
return s;
}
/****************************************************************************/
char*
getecline(FILE *f) /* read an edge_code line */
/* No trailing \n or \0 is added. Immediate EOF causes NULL return. */
{
size_t headsize,bodysize;
int sizesize,edgesize;
int c1,c,i;
DYNALLSTAT(unsigned char,s,s_sz);
FLOCKFILE(f);
if ((c1 = GETC(f)) == EOF) return NULL;
if (c1 > 0)
{
bodysize = c1;
edgesize = 1;
headsize = 1;
}
else
{
if ((c = GETC(f)) == EOF)
gt_abort(">E Incomplete edge_code line\n");
else
{
sizesize = c >> 4;
edgesize = c & 0xF;
bodysize = 0;
for (i = 0; i < sizesize; ++i)
{
if ((c = GETC(f)) == EOF)
gt_abort(">E Incomplete edge_code line\n");
else
bodysize = (bodysize << 8) + c;
}
headsize = 2 + sizesize;
}
}
DYNALLOC1(unsigned char,s,s_sz,headsize+bodysize,"getecline");
s[0] = (unsigned char)c1;
if (c1 == 0)
{
s[1] = (char)((sizesize << 4) + edgesize);
for (i = 0; i < sizesize; ++i)
s[headsize-1-i] = (bodysize >> 8*i) & 0xFF;
}
if (bodysize > 0 && fread(s+headsize,bodysize,1,f) != bodysize)
gt_abort(">E Incomplete edge_code line\n");
FUNLOCKFILE(f);
return (char*)s;
}
int
graphsize(char *s)
/* Get size of graph out of graph6, digraph6 or sparse6 string. */
{
char *p;
int n;
if (s[0] == ':' || s[0] == '&') p = s+1;
else p = s;
n = *p++ - BIAS6;
if (n > SMALLN)
{
n = *p++ - BIAS6;
if (n > SMALLN)
{
n = *p++ - BIAS6;
n = (n << 6) | (*p++ - BIAS6);
n = (n << 6) | (*p++ - BIAS6);
n = (n << 6) | (*p++ - BIAS6);
n = (n << 6) | (*p++ - BIAS6);
n = (n << 6) | (*p++ - BIAS6);
}
else
{
n = (n << 6) | (*p++ - BIAS6);
n = (n << 6) | (*p++ - BIAS6);
}
}
return n;
}
/****************************************************************************/
void
encodegraphsize(int n, char **pp)
/* Encode the size n in a string starting at **p, and reset **p
to point to the character after the size */
{
char *p;
p = *pp;
if (n <= SMALLN)
*p++ = (char)(BIAS6 + n);
else if (n <= SMALLISHN)
{
*p++ = MAXBYTE;
*p++ = (char)(BIAS6 + (n >> 12));
*p++ = (char)(BIAS6 + ((n >> 6) & C6MASK));
*p++ = (char)(BIAS6 + (n & C6MASK));
}
else
{
*p++ = MAXBYTE;
*p++ = MAXBYTE;
*p++ = (char)(BIAS6 + (n >> 30));
*p++ = (char)(BIAS6 + ((n >> 24) & C6MASK));
*p++ = (char)(BIAS6 + ((n >> 18) & C6MASK));
*p++ = (char)(BIAS6 + ((n >> 12) & C6MASK));
*p++ = (char)(BIAS6 + ((n >> 6) & C6MASK));
*p++ = (char)(BIAS6 + (n & C6MASK));
}
*pp = p;
}
/****************************************************************************/
void
stringcounts(char *s, int *pn, size_t *pe)
/* Determine number of edges of graph6, digraph6 or sparse6 string */
{
char *p;
int i,j,k,x,nb,v,n,need;
size_t count;
boolean done;
n = graphsize(s);
*pn = n;
p = s + (s[0] == ':' || s[0] == '&') + SIZELEN(n);
if (s[0] == ':') /* sparse6 */
{
count = 0;
for (i = n-1, nb = 0; i > 0 ; i >>= 1, ++nb) {}
k = 0;
v = 0;
done = FALSE;
while (!done)
{
if (k == 0)
{
x = *(p++);
if (x == '\n' || x == '\0')
{
done = TRUE; continue;
}
else
{
x -= BIAS6; k = 6;
}
}
if ((x & B(k))) ++v;
--k;
need = nb;
j = 0;
while (need > 0 && !done)
{
if (k == 0)
{
x = *(p++);
if (x == '\n' || x == '\0')
{
done = TRUE; continue;
}
else
{
x -= BIAS6; k = 6;
}
}
if (need >= k)
{
j = (j << k) | (x & M(k));
need -= k; k = 0;
}
else
{
k -= need;
j = (j << need) | ((x >> k) & M(need));
need = 0;
}
}
if (done) continue;
if (j > v)
v = j;
else if (v < n)
++count;
}
}
else /* graph6 or digraph6 */
{
count = 0;
for (; *p != '\n' && *p != '\0'; ++p)
count += bytecount[*p - BIAS6];
}
*pe = count;
}
/****************************************************************************/
void
stringtograph(char *s, graph *g, int m)
/* Convert string (graph6, digraph6 or sparse6 format) to graph. */
/* Assumes g is big enough to hold it. */
{
char *p;
int n,i,j,k,v,x,nb,need;
size_t ii;
set *gi,*gj;
boolean done;
n = graphsize(s);
if (n == 0) return;
p = s + (s[0] == ':' || s[0] == '&') + SIZELEN(n);
if (TIMESWORDSIZE(m) < n)
gt_abort(">E stringtograph: impossible m value\n");
for (ii = m*(size_t)n; --ii > 0;) g[ii] = 0;
g[0] = 0;
if (s[0] != ':' && s[0] != '&') /* graph6 format */
{
k = 1;
for (j = 1; j < n; ++j)
{
gj = GRAPHROW(g,j,m);
for (i = 0; i < j; ++i)
{
if (--k == 0)
{
k = 6;
x = *(p++) - BIAS6;
}
if ((x & TOPBIT6))
{
gi = GRAPHROW(g,i,m);
ADDELEMENT(gi,j);
ADDELEMENT(gj,i);
}
x <<= 1;
}
}
}
else if (s[0] == '&')
{
k = 1;
for (i = 0; i < n; ++i)
{
gi = GRAPHROW(g,i,m);
for (j = 0; j < n; ++j)
{
if (--k == 0)
{
k = 6;
x = *(p++) - BIAS6;
}
if ((x & TOPBIT6))
{
ADDELEMENT(gi,j);
}
x <<= 1;
}
}
}
else /* sparse6 format */
{
for (i = n-1, nb = 0; i > 0 ; i >>= 1, ++nb) {}
k = 0;
v = 0;
done = FALSE;
while (!done)
{
if (k == 0)
{
x = *(p++);
if (x == '\n' || x == '\0')
{
done = TRUE; continue;
}
else
{
x -= BIAS6; k = 6;
}
}
if ((x & B(k))) ++v;
--k;
need = nb;
j = 0;
while (need > 0 && !done)
{
if (k == 0)
{
x = *(p++);
if (x == '\n' || x == '\0')
{
done = TRUE; continue;
}
else
{
x -= BIAS6; k = 6;
}
}
if (need >= k)
{
j = (j << k) | (x & M(k));
need -= k; k = 0;
}
else
{
k -= need;
j = (j << need) | ((x >> k) & M(need));
need = 0;
}
}
if (done) continue;
if (j > v)
v = j;
else if (v < n)
{
ADDELEMENT(GRAPHROW(g,v,m),j);
ADDELEMENT(GRAPHROW(g,j,m),v);
}
}
}
}
/****************************************************************************/
void
stringtograph_inc(char *s, graph *g, int m,
graph *prevg, int prevn)
/* Convert string (graph6, digraph6 or sparse6 format) to graph,
allowing incremental sparse6 format with a prior graph assumed
to have matching m,n values.
If prevg != NULL and type is is6, use prevg as prior graph.
Assumes g is big enough to hold it.
*digraph is set according to the graph type.
*/
{
char *p;
int n,i,j,k,v,x,nb,need;
size_t ii;
set *gi,*gj;
boolean done;
if (s[0] == ';' && !prevg)
gt_abort(">E stringtograph_inc missing prior graph\n");
if (s[0] == ';')
{
n = prevn;
if (n == 0) return;
p = s + 1;
for (ii = m*(size_t)n; --ii > 0;) g[ii] = prevg[ii];
g[0] = prevg[0];
}
else
{
n = graphsize(s);
if (n == 0) return;
p = s + (s[0] == ':' || s[0] == '&') + SIZELEN(n);
for (ii = m*(size_t)n; --ii > 0;) g[ii] = 0;
g[0] = 0;
}
if (TIMESWORDSIZE(m) < n)
gt_abort(">E stringtograph_inc: impossible m value\n");
if (s[0] != ':' && s[0] != ';' && s[0] != '&') /* graph6 format */
{
k = 1;
for (j = 1; j < n; ++j)
{
gj = GRAPHROW(g,j,m);
for (i = 0; i < j; ++i)
{
if (--k == 0)
{
k = 6;
x = *(p++) - BIAS6;
}
if ((x & TOPBIT6))
{
gi = GRAPHROW(g,i,m);
FLIPELEMENT(gi,j);
if (i != j) FLIPELEMENT(gj,i);
}
x <<= 1;
}
}
}
else if (s[0] == '&') /* digraph6 format */
{
k = 1;
for (j = 0; j < n; ++j)
{
gj = GRAPHROW(g,j,m);
for (i = 0; i < n; ++i)
{
if (--k == 0)
{
k = 6;
x = *(p++) - BIAS6;
}
if ((x & TOPBIT6))
{
FLIPELEMENT(gj,i);
}
x <<= 1;
}
}
}
else /* sparse6 format */
{
for (i = n-1, nb = 0; i != 0 ; i >>= 1, ++nb) {}
k = 0;
v = 0;
done = FALSE;
while (!done)
{
if (k == 0)
{
x = *(p++);
if (x == '\n' || x == '\0')
{
done = TRUE; continue;
}
else
{
x -= BIAS6; k = 6;
}
}
if ((x & B(k))) ++v;
--k;
need = nb;
j = 0;
while (need > 0 && !done)
{
if (k == 0)
{
x = *(p++);
if (x == '\n' || x == '\0')
{
done = TRUE; continue;
}
else
{
x -= BIAS6; k = 6;
}
}
if (need >= k)
{
j = (j << k) | (x & M(k));
need -= k; k = 0;
}
else
{
k -= need;
j = (j << need) | ((x >> k) & M(need));
need = 0;
}
}
if (done) continue;
if (j > v)
v = j;
else if (v < n)
{
FLIPELEMENT(GRAPHROW(g,v,m),j);
if (j != v) FLIPELEMENT(GRAPHROW(g,j,m),v);
}
}
}
}
/***********************************************************************/
graph* /* read graph into nauty format */
readgg(FILE *f, graph *g, int reqm, int *pm, int *pn, boolean *digraph)
/* graph6, digraph6 and sparse6 formats are supported
f = an open file
g = place to put the answer (NULL for dynamic allocation)
reqm = the requested value of m (0 => compute from n)
*pm = the actual value of m
*pn = the value of n
*digraph = whether the input is a digraph
*/
{
char *s,*p;
int m,n;
if ((readg_line = gtools_getline(f)) == NULL) return NULL;
s = readg_line;
if (s[0] == ':')
{
readg_code = SPARSE6;
*digraph = FALSE;
p = s + 1;
}
else if (s[0] == '&')
{
readg_code = DIGRAPH6;
*digraph = TRUE;
p = s + 1;
}
else
{
readg_code = GRAPH6;
*digraph = FALSE;
p = s;
}
while (*p >= BIAS6 && *p <= MAXBYTE)
++p;
if (*p == '\0')
gt_abort(">E readgg: missing newline\n");
else if (*p != '\n')
gt_abort(">E readgg: illegal character\n");
n = graphsize(s);
if (readg_code == GRAPH6 && p - s != G6LEN(n))
gt_abort(">E readgg: truncated graph6 line\n");
if (readg_code == DIGRAPH6 && p - s != D6LEN(n))
gt_abort(">E readgg: truncated digraph6 line\n");
if (reqm > 0 && TIMESWORDSIZE(reqm) < n)
gt_abort(">E readgg: reqm too small\n");
else if (reqm > 0)
m = reqm;
else
m = (n + WORDSIZE - 1) / WORDSIZE;
if (g == NULL)
{
if ((g = (graph*)ALLOCS(n,m*sizeof(graph))) == NULL)
gt_abort(">E readgg: malloc failed\n");
}
*pn = n;
*pm = m;
stringtograph(s,g,m);
return g;
}
/***********************************************************************/
graph* /* read undirected graph into nauty format */
readg(FILE *f, graph *g, int reqm, int *pm, int *pn)
/* graph6 and sparse6 formats are supported
f = an open file
g = place to put the answer (NULL for dynamic allocation)
reqm = the requested value of m (0 => compute from n)
*pm = the actual value of m
*pn = the value of n
Only allows undirected graphs.
*/
{
boolean digraph;
graph *gg;
gg = readgg(f,g,reqm,pm,pn,&digraph);
if (!gg) return NULL;
if (digraph)
gt_abort(">E readg() doesn't all digraphs; use readgg()\n");
return gg;
}
/***********************************************************************/
int
checkgline(char *s)