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Annotation of researchv10no/cmd/asd/pwd.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  *     pwd() - return the name of the current directory.
                      3:  *     We assume that the current directory never changes.
                      4:  */
                      5: 
                      6: #include "asd.h"
                      7: 
                      8: #define CHUNK 64
                      9: 
                     10: char *
                     11: pwd()
                     12: {
                     13:        register FILE *f;
                     14:        static char *r;
                     15:        static unsigned size;
                     16:        register int n, c;
                     17: 
                     18:        if (r == NULL) {
                     19:                f = popen ("pwd", "r");
                     20:                schk ((char *) f);
                     21:                
                     22:                n = 0;
                     23:                while ((c = getc (f)) != EOF) {
                     24:                        if (n >= size) {
                     25:                                size += CHUNK;
                     26:                                r = ralloc (r, size);
                     27:                        }
                     28:                        r[n++] = c;
                     29:                }
                     30: 
                     31:                /* replace the trailing newline by a null */
                     32:                r[n - 1] = '\0';
                     33: 
                     34:                pclose (f);
                     35:        }
                     36: 
                     37:        return r;
                     38: }

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