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#ifndef lint |
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static const char RCSid[] = "$Id: wordfile.c,v 2.17 2016/03/22 15:14:39 greg Exp $"; |
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#endif |
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/* |
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* Load whitespace separated words from a file into an array. |
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* Assume the passed pointer array is big enough to hold them all. |
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* |
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* External symbols declared in standard.h |
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*/ |
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|
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#include "copyright.h" |
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|
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#include <ctype.h> |
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#include <string.h> |
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#include <stdio.h> |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <fcntl.h> |
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|
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#include "platform.h" |
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#include "standard.h" |
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|
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|
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#define MAXWLEN 4096 /* words must be shorter than this */ |
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|
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|
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int |
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wordfile( /* get words from fname, put in words */ |
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char **words, |
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int nargs, |
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char *fname |
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) |
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{ |
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int wrdcnt = 0; |
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int n = 0; |
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int fd; |
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char buf[MAXWLEN]; |
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/* load file into buffer */ |
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if (fname == NULL || !*fname) |
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return(-1); /* no filename */ |
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if (nargs <= 1) |
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return(-1); |
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if ((fd = open(fname, 0)) < 0) |
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return(-1); /* open error */ |
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words[0] = NULL; |
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while (nargs > 1 && (n += read(fd, buf+n, MAXWLEN-n)) > 0) { |
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int crem = 0; |
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if (n >= MAXWLEN) /* still something left? */ |
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while (!isspace(buf[--n])) { |
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if (n <= 0) /* one long word! */ |
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goto done; |
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++crem; |
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} |
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buf[n] = '\0'; /* terminate & parse */ |
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n = wordstring(words, nargs, buf); |
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if (n < 0) { |
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wrdcnt = -1; /* memory error */ |
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break; |
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} |
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words += n; nargs -= n; |
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wrdcnt += n; |
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if ((n = crem) > 0) /* move remainder */ |
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memmove(buf, buf+MAXWLEN-crem, crem); |
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} |
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done: |
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close(fd); |
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return(wrdcnt); |
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} |
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|
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|
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int |
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wordstring( /* allocate and load argument list */ |
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char **avl, |
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int nargs, |
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char *str |
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) |
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{ |
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char *cp, **ap; |
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|
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if (str == NULL) |
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return(-1); |
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cp = bmalloc(strlen(str)+1); |
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if (cp == NULL) /* ENOMEM */ |
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return(-1); |
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strcpy(cp, str); |
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/* parse into words */ |
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for (ap = avl; ap-avl < nargs-1; ap++) { |
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while (isspace(*cp)) /* nullify spaces */ |
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*cp++ = '\0'; |
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if (!*cp) /* all done? */ |
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break; |
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*ap = cp; /* add argument to list */ |
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while (*++cp && !isspace(*cp)) |
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; |
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} |
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*cp = '\0'; /* terminates overflow */ |
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*ap = NULL; |
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return(ap - avl); |
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} |
