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Add support for "grep -n"

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This commit is contained in:
Pierre Pronchery 2017-01-31 21:56:27 +01:00
parent c1c15e768b
commit 97cdc17553
1 changed files with 31 additions and 14 deletions
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45
src/grep.c
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@ -29,8 +29,14 @@
/* grep */
/* private */
/* types */
/* Prefs */
typedef int Prefs;
#define GREP_PREFS_n 0x1
/* prototypes */
static int _grep(int flags, char const * pattern, int filec, char * filev[]);
static int _grep(Prefs * prefs, int flags, char const * pattern,
int filec, char * filev[]);
static int _usage(void);
@ -38,10 +44,12 @@ static int _usage(void);
/* functions */
/* grep */
static int _grep_error(char const * message, int ret);
static int _grep_files(regex_t * reg, int filec, char * filev[]);
static int _grep_stream(regex_t * reg, FILE * fp, char const * filename);
static int _grep_files(Prefs * prefs, regex_t * reg, int filec, char * filev[]);
static int _grep_stream(Prefs * prefs, regex_t * reg, FILE * fp,
char const * filename);
static int _grep(int flags, char const * pattern, int filec, char * filev[])
static int _grep(Prefs * prefs, int flags, char const * pattern,
int filec, char * filev[])
{
int ret;
regex_t reg;
@ -59,9 +67,9 @@ static int _grep(int flags, char const * pattern, int filec, char * filev[])
return _grep_error(buf, 2);
}
if(filec == 0)
ret = _grep_stream(&reg, stdin, NULL);
ret = _grep_stream(prefs, &reg, stdin, NULL);
else
ret = _grep_files(&reg, filec, filev);
ret = _grep_files(prefs, &reg, filec, filev);
regfree(&reg);
return ret;
}
@ -72,7 +80,7 @@ static int _grep_error(char const * message, int ret)
return ret;
}
static int _grep_files(regex_t * reg, int filec, char * filev[])
static int _grep_files(Prefs * prefs, regex_t * reg, int filec, char * filev[])
{
int ret = 1;
int i;
@ -88,8 +96,8 @@ static int _grep_files(regex_t * reg, int filec, char * filev[])
ret = _grep_error(buf, 2);
continue;
}
if(_grep_stream(reg, fp, (filec > 1) ? filev[i] : NULL) == 0
&& ret == 1)
if(_grep_stream(prefs, reg, fp, (filec > 1) ? filev[i] : NULL)
== 0 && ret == 1)
ret = 0;
if(fclose(fp) != 0)
{
@ -101,18 +109,22 @@ static int _grep_files(regex_t * reg, int filec, char * filev[])
return ret;
}
static int _grep_stream(regex_t * reg, FILE * fp, char const * filename)
static int _grep_stream(Prefs * prefs, regex_t * reg, FILE * fp,
char const * filename)
{
int ret = 1;
size_t line;
char buf[BUFSIZ];
regmatch_t match;
int e;
while(fgets(buf, sizeof(buf), fp) != NULL)
for(line = 1; fgets(buf, sizeof(buf), fp) != NULL; line++)
if((e = regexec(reg, buf, 1, &match, 0)) == 0)
{
if(filename != NULL)
printf("%s:", filename);
if(prefs != NULL && *prefs & GREP_PREFS_n)
printf("%zd:", line);
printf("%s", buf);
if(ret == 1)
ret = 0;
@ -129,7 +141,7 @@ static int _grep_stream(regex_t * reg, FILE * fp, char const * filename)
/* usage */
static int _usage(void)
{
fputs("Usage: " PROGNAME " [-Ei][file...]\n", stderr);
fputs("Usage: " PROGNAME " [-Ein][file...]\n", stderr);
return 1;
}
@ -140,9 +152,10 @@ static int _usage(void)
int main(int argc, char * argv[])
{
int o;
Prefs prefs = 0;
int flags = 0;
while((o = getopt(argc, argv, "Ei")) != -1)
while((o = getopt(argc, argv, "Ein")) != -1)
switch(o)
{
case 'E':
@ -151,10 +164,14 @@ int main(int argc, char * argv[])
case 'i':
flags |= REG_ICASE;
break;
case 'n':
prefs |= GREP_PREFS_n;
break;
default:
return _usage();
}
if(optind == argc)
return _usage();
return _grep(flags, argv[optind], argc - optind - 1, &argv[optind + 1]);
return _grep(&prefs, flags, argv[optind], argc - optind - 1,
&argv[optind + 1]);
}