pg(1): update style
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383d53168f
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34C0543BBB6AF81B
224
src/pg.c
224
src/pg.c
@ -16,7 +16,9 @@
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* along with this program. If not, see https://www.gnu.org/licenses/.
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*/
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#include <assert.h> /* assert(3) */
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#include <errno.h> /* errno */
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#include <stdbool.h> /* bool */
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#include <stdio.h> /* fclose(3), feof(3), fgetc(3), fgets(3), fopen(3),
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* fprintf(3), fputc(3), stderr, stdin, stdout, EOF, FILE,
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* NULL */
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@ -38,15 +40,18 @@ static struct {
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size_t quantity;
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enum { LINES = 0, BYTES = 1 } type;
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} default_page_unit = { 22, LINES } /* Plan 9 default */;
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static FILE *input;
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static char *prompt = ": ";
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static char *program_name = "pg";
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static char *permute_out(char *str, size_t index){
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size_t j;
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for(j = index; str[j - 1] != '\0'; ++j)
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str[j - 1] = str[j];
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static char *
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permute_out(char *str, size_t i) {
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for (
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;
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str[i - 1] != '\0';
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str[i - 1] = str[i], ++i
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);
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return str;
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}
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@ -56,50 +61,45 @@ static char *permute_out(char *str, size_t index){
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* literal. The behavior of strtok_quoted when '"' or '\\' are in sep is
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* undefined. */
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/* TODO: Seems to only ever return NULL. */
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static char *strtok_quoted(char *str, char *sep){
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static char *
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strtok_quoted(char *str, char *sep) {
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static char *s;
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size_t i;
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size_t j;
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if(str != NULL)
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s = str;
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if (str != NULL) { s = str; }
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while(strchr(sep, *s) == NULL)
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if(*++s == '\0')
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return NULL; /* no remaining characters except seperators */
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while (strchr(sep, *s) == NULL) {
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if(*++s == '\0') { return NULL; } /* no remaining except seps */
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}
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{
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char in_escape;
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int in_quotes;
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bool in_escape = 0;
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int in_quotes = -1; /* index of quote, or -1 if none */
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in_escape = 0;
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in_quotes = -1;
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for(i = 0; s[i] != '\0'; ++i)
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switch(s[i]){
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case '\\':
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if(in_escape)
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permute_out(s, i--);
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in_escape = !in_escape;
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break;
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case '"':
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if(in_escape){
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s[i] = s[i - 1];
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permute_out(s, i--);
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}else if(in_quotes != -1){
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permute_out(s, in_quotes);
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--i;
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permute_out(s, i--);
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in_quotes = -1;
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}else
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in_quotes = i;
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break;
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case '\0':
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return s;
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default:
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if(!in_escape && strchr(sep, s[i]) != NULL){
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s[i] = '\0';
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return s;
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}
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for (size_t i = 0; s[i] != '\0'; ++i)
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switch (s[i]) {
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case '\\':
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/* if literal \\, permute out a backslash */
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if (in_escape) { permute_out(s, i--); }
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in_escape = !in_escape;
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break;
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case '"':
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if (in_escape) { // \"
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s[i] = s[i - 1];
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permute_out(s, i--); // permute out backslash
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} else if (in_quotes != -1) {
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permute_out(s, in_quotes); --i; // permute out first "
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permute_out(s, i--); // permute out second "
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in_quotes = -1;
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} else { in_quotes = i; }
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break;
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case '\0': return s;
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default:
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if (!in_escape && strchr(sep, s[i]) != NULL) {
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s[i] = '\0';
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return s;
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}
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}
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}
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@ -108,53 +108,56 @@ static char *strtok_quoted(char *str, char *sep){
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/* Page at most l bytes from f without consideration of a buffer (print them to
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* stdout). */
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static int pg_b_u(FILE *f, size_t l){
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static int
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pg_b_u(FILE *f, size_t l) {
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int c;
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while((c = fgetc(f)) != EOF)
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if((c = fputc(c, stdout)) == EOF || --l == 0)
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break;
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while ((c = fgetc(f)) != EOF) {
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if ((c = fputc(c, stdout)) == EOF || --l == 0) { break; }
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}
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return c;
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}
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/* Page at most l lines, which are lengths of characters terminated by nl, from
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* f without consideration of a buffer (print them to stdout). */
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static int pg_l_u(FILE *f, size_t l, char nl){
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static int
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pg_l_u(FILE *f, size_t l, char nl) {
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int c;
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while((c = fgetc(f)) != EOF)
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if((c = fputc(c, stdout)) == EOF || (l -= (c == nl)) == 0)
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break;
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while ((c = fgetc(f)) != EOF) {
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if ((c = fputc(c, stdout)) == EOF || (l -= (c == nl)) == 0) { break; }
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}
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return c;
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}
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static int cmd_quit(int argc, char **argv, char **envp){return EX_UNAVAILABLE;}
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static int cmd_default_page(int argc, char **argv, char **envp){
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static int
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cmd_quit(int argc, char **argv, char **envp) { return EX_UNAVAILABLE; }
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if(argc > 1) /* This shouldn't be possible. */
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return EX_USAGE;
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if(default_page_unit.type == BYTES)
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static int
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cmd_default_page(int argc, char **argv, char **envp) {
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if (argc > 1) { return EX_USAGE; } // should be impossible
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else if (default_page_unit.type == BYTES) {
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return pg_b_u(input, default_page_unit.quantity) == EOF
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? EX_UNAVAILABLE
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: EX_OK;
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else if(default_page_unit.type == LINES)
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} else if (default_page_unit.type == LINES) {
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return pg_l_u(input, default_page_unit.quantity, '\n') == EOF
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? EX_UNAVAILABLE
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: EX_OK;
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else
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return EX_SOFTWARE;
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} else { return EX_SOFTWARE; }
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}
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static int cmd_page_down_lines(int argc, char **argv, char **envp){
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switch(argc){
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case 1:
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return cmd_default_page(argc, argv, envp);
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case 2: /* not implemented */
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default:
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fprintf(stderr, "Usage: %s" /*" (lines)"*/ "\n", argv[0]);
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return EX_USAGE;
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static int
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cmd_page_down_lines(int argc, char **argv, char **envp) {
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switch (argc) {
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case 1: return cmd_default_page(argc, argv, envp);
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case 2: /* not implemented */
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default:
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fprintf(stderr, "Usage: %s" /*" (lines)"*/ "\n", argv[0]);
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return EX_USAGE;
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}
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}
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@ -175,86 +178,97 @@ builtins[] = {
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#define ARGV_MAX 10
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/* Find and execute the command in the command map, given a corresponding
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* command line. */
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static int cmdline_exec(struct CmdMap *map, char *cmdline, char **envp){
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static int
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cmdline_exec(struct CmdMap *map, char *cmdline, char **envp) {
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/* Command line word splitting is naive and based on whitespace ONLY; no
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* fancy quoting or escaping here. Adding that would (ideally) entail
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* replacing strtok(3) with something specific to this task. */
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static int argc;
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static char *argv[ARGV_MAX];
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if((argv[(argc = 0)] = strtok(cmdline, whitespace)) == NULL){
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while(cmdline[0] != '\0')
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cmdline = &cmdline[1];
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if ((argv[(argc = 0)] = strtok(cmdline, whitespace)) == NULL) {
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while (cmdline[0] != '\0') { cmdline = &cmdline[1]; }
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argv[argc] = cmdline;
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argv[++argc] = NULL;
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}else{
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while((argv[++argc] = strtok(NULL, whitespace)) != NULL
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&& argc < ARGV_MAX);
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} else {
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while (
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(argv[++argc] = strtok(NULL, whitespace)) != NULL
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&& argc < ARGV_MAX
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);
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}
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for(; map->name != NULL; map = &map[1])
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if(strcmp(map->name, argv[0]) == 0)
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for (; map->name != NULL; map = &map[1]) {
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if(strcmp(map->name, argv[0]) == 0) {
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return map->fn(argc, argv, envp);
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}
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}
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fprintf(stderr, "%s: %s: not found\n", program_name, argv[0]);
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return EX_USAGE;
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}
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int usage(char *s){
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fprintf(stderr, "Usage: %s (-p [prompt])\n", s);
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int usage(char *argv0) {
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(void)fprintf(stderr, "Usage: %s [-p prompt]\n", argv0);
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return EX_USAGE;
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}
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int main(int argc, char *argv[]){
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int main(int argc, char *argv[]) {
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unsigned char cmd[CMDLINE_MAX];
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FILE *t;
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input = stdin;
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if(argc < 1)
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program_name = argv[0];
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else{
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if (argc > 0) {
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int c;
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while((c = getopt(argc, argv, "p:")) != -1)
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switch(c){
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case 'p': prompt = optarg; break;
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default:
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return usage(program_name);
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program_name = argv[0];
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while ((c = getopt(argc, argv, "p:")) != -1) {
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switch (c) {
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case 'p': prompt = optarg; break;
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default: return usage(program_name);
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}
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}
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}
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if(argc > optind)
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return usage(program_name);
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if(argc > optind) { return usage(program_name); }
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if((t = fopen("/dev/tty", "rb")) == NULL){
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fprintf(stderr, "%s: /dev/tty: %s\n", program_name, strerror(errno));
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(void)fprintf(
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stderr,
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"%s: /dev/tty: %s\n",
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program_name,
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strerror(errno)
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);
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return EX_OSERR;
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}
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for(;;){
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for (;;) {
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fputs(prompt, stderr);
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fgets((char *)cmd, (sizeof cmd) / (sizeof *cmd), t);
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if(strchr((char *)cmd, '\n') == NULL){ /* fast-forward stream */
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if(strchr((char *)cmd, '\n') == NULL) { /* fast-forward stream */
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int c;
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while((c = fgetc(t)) != '\n')
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if(c == EOF)
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break;
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while ((c = fgetc(t)) != '\n') {
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if (c == EOF) { break; }
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}
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}
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if(feof(t))
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return EX_OK;
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if(feof(t)) { return EX_OK; }
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{ int r;
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switch((r = cmdline_exec(builtins, (char *)cmd, NULL))){
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case EX_OK: case EX_USAGE: break;
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case EX_UNAVAILABLE: return EX_OK;
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default: return r;
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} }
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{
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int r;
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switch ((r = cmdline_exec(builtins, (char *)cmd, NULL))){
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case EX_OK: case EX_USAGE: break;
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case EX_UNAVAILABLE: return EX_OK;
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default: return r;
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}
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}
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}
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/* UNREACHABLE */
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return EX_SOFTWARE;
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/* UNREACHABLE */ assert(0);
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}
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